Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dd5dab896ea9d7…

MALICIOUS

PDF

91.6 KB Created: 2021-06-09 22:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d2cf09be0d7d970e98e3ff830b46880b SHA-1: b75b2ddb7350108685c091047b8f1bdac502d8c8 SHA-256: a3dd5dab896ea9d7cea365af64aec2e89da6f3a33966bb5bb16cfe0284404fa4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to redirect users to download sites. The presence of a 'download button' heuristic further supports the phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://queure.ru/uplcv?utm_term=cleo+gold+free+download PDF link annotation
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd8032d4d---fepugid.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31260137396.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/vufudofotovofujabuw.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/390dde4176dc5045a3d449ba725134b4/55993941023.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a3f765ef0---18511279630.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc34d6339---60579521223.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076578d86252---75363974432.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9cm90qb8grf562tfqerrt9514j/zixewapidebibetegatisaka.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4a782e59---46856667958.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/315d7952a799fe255c3f132c239267f6/36497808161.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f188e5d8ee---lakuni.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/45305865386.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dad52abc8---3628653941.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/iafah7a5h3ptcbvnaenlsrhqsu/rinisizavaguzim.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4980a1d3752d08f4cd1d51d6582aec38/67887679002.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e9fc8d9e---75744026900.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479e95e58d---35022247750.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ebbb8af0---36222311339.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829d2544c50---zukekonenakirexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013f4f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F4F 20012 bytes
SHA-256: 9696ebdfae90842c7efc31525098074be46ad40710ec589ad01be59abadfcd34
font_00_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 4896 bytes
SHA-256: a3c13e2f86563f6a3ce6949efb8c2c6eb282f6ee669a94bf6ded4835798d6280
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 3160 bytes
SHA-256: e74f7e8c146b3734d59c373e961576bbf9b1a775821ebb98ea4f96cb9ec78804
font_02_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 13720 bytes
SHA-256: 3263a5615212ba94f5e70e79bc06171cb0ad95172501845a145d8029bbec8ff1

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