Malicious PDF — malware analysis report

Static analysis result for SHA-256 06992b94b5651e93…

MALICIOUS

PDF

90.4 KB Created: 2021-08-19 01:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4590ebdc8826b37f773451e0742b0c7 SHA-1: 52e5a7b6a00e483340cb5cab914f622c68e929f4 SHA-256: 06992b94b5651e93f66dd3aeadfd0a87baf480f78924c963d4d57401ff5029af
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload directories or appear to be disposable. The document body, though heavily obfuscated, suggests a lure related to invoices or callback phishing, consistent with the PDF_SEO_DISPOSABLE_LINK_FARM and SE_INVOICE_LURE heuristics. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent, likely leading to phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://blueleaves.ru/userfiles/file/vofajexukotexusetafaso.pdf In PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/45841760741.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/35752305107.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/zimuwoxusijopeguzanufij.pdfIn PDF document text
    • http://korytnica.net/data/files/95793443251.pdfIn PDF document text
    • http://fxmeat.com/upload/file/988c9e26c97276228f24567fefafc802.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/36681629585.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ql7akp8te1u0hnlr0opv5vjp9d/xoxasexededelabido.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/jajadezos.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/96121984229.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nolipawe.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/77601890262.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4i7ctg9vvl59n71rfe6ev92q98/54506324895.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/94582873419.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9fc73c9c---wivaxowojumemiguxixu.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/8138017547.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/zasasul.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/71402062833.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee99bc928f---vawubimivebobopunu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cc5961mrmtgucngqco8dr85egq/57906435103.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/53147966768.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bba7cf0ebb2a399f81ed58fbfb39ebf5/xipisakilori.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/95050181334.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f692d4e5fe---mobadevewowipijotuzisi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce8aa729c---jesivalodawedesixuma.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f565ad35---75953806242.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16108d84d2e27e---81604468766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+clean+bissell+proheat+2x+advancedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 11116 bytes
SHA-256: 5dc22a1a9c8f0a24c1461a6c79c4ecb74d76accbb8027aaf793bdb57aaab2ff3
font_01_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 17644 bytes
SHA-256: fd40ff5aa6df157fb921885c9a7300b73d70d7eaa20695c1bc5f622691c27742
font_02_sfnt_off00014112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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