Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ae4529c067ce76…

MALICIOUS

PDF

84.6 KB Created: 2021-07-13 22:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7417df75962d1e0b439ba794a002978b SHA-1: 4374e6e81c2cf8048c0ce3f4b6a6167e9dcc444e SHA-256: f6ae4529c067ce76d801015c5253624b8fcc4b3dc50112f69498136b39f7473a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The presence of multiple links on disposable or compromised hosting further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://aweibel.com/Photo/file/fubuvot.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca2fa1ed8---jesugeselaxelinufejop.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d4ab795f56cae84d925495e30d3a8be6/50077165866.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lnuijko98a1ildlmhv96fbldl2/nuradizodi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e177059295---55846296521.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/towupupa.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4bc1a011---73022917890.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf2a1ba143---babugirunejawij.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/guxefibegumofev.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lusirozunekiwozizemamim.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160842b0b127e7---15586634989.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/53149431870.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/redukoxufebowaka.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tilebukodozoga.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0a70c454---93826183356.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/fopitupezavivawe.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/99880368327.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/45891173362.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/15927808759.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899857120a---tekivogolosasuguwitav.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/fd06e20f30c8a86f186b13f36bfcad86/durexovo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bd2744d83917293231b81206672b95cd/57294264661.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mg7d52d1571h601a2pafvm1vbi/danararirugenejetilogifod.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/31576570170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=use+of+plastic+in+building+construction+pdfPDF 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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 16992 bytes
SHA-256: 4557a64be10e73f676c9e354febc0b12a2d6cbad3e041d0ea25574e817dcc006
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 11040 bytes
SHA-256: 30e39e93d9219e2d69ae243d4c4b6f1b120ecb18aa76ae28a4959bfe43237bb4