Malicious PDF — malware analysis report

Static analysis result for SHA-256 2368edb82df09e7d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 10:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 934ed318442d993f3de83df3dde2f1a4 SHA-1: be4e82e3ff27aad4b9335c3328ec6210308518b4 SHA-256: 2368edb82df09e7d61c7b54e4d1ae8bbab873498fcbb0dcfcef7e3c1536e0529
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to URLs hosted on compromised WordPress sites, likely to serve a malicious payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially compromised CMS upload directories strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830a546aa88---segixerunikikutenu.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093af651e2b9---mibonisibezinolazuji.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/gukomazom.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/wofejovumufobojopes.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/dudiwu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/bb9f10f6b6bfc7a2dedcb792ff4cab60/kimud.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/dozokurikis.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084aaedeb5c5---25362652870.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/fegeruwimokujadipofoso.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4637ab9c---xujuwudupumejaba.pdfIn PDF document text
    • http://consade.com/userfiles/file/fevujofa.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/sevufenopojipevapo.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/leragesokurujaponixog.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/i4c1ho116rbgr8v2696aj6aj2g/xoxetexiperifonapapoji.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14d82ca547---fegubul.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/vopozipopinomoseg.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/pozidumamojukenepivuwuwa.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5bf884b576860c623aee5340de5b6bd8/wibodemogolakudanod.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/85f5f794747e5c9bd709904333b32304/75824243802.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fakojapog.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780c05a5a5a---famexuwozux.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/tuwegi.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/zowobefatas.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7a86a91a---26737272570.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161156354c1434---werixokimuzexojezin.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/82040364074.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c040b3df8---jowuwisegilib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ix35+2012+manualPDF 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_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 10312 bytes
SHA-256: 3297f1d0c7437b675e68b4ce8d9f17ca5d0b21d92aa2d5243a47d74d7f1bdb46
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 19612 bytes
SHA-256: abacea6e8008f2b4ea3b74e1e3f028b2445d1bd5ef6e05b913bd65b3120734e6
font_02_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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