Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cf1ef6a320f734…

MALICIOUS

PDF

126.0 KB Created: 2021-06-27 06:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c4502e3a06f978204f6549ba4bdcfaf1 SHA-1: cadff8b0e216493b971c42cb0a07f142bdfe05f7 SHA-256: a6cf1ef6a320f734ac92a2f490eb8b88e6fad37145c44efbe7ea96291f2acd10
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 6

  • 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.
  • 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://syntellect.ru/Repository/file/55660538417.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b4f0cf2ee6929c09f9f7019c279902eb/zexusofemifojidemipuj.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/10463501722.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/0ukp54f1jq41j5quha2h7ds3vl/xegedaviralerinoril.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aed5113abcf---3366790634.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3666ddafdb---davesaxazupadobu.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/42395906275.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1d071cee---mepanaluridoxobirijuzudix.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/96750933513.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef4c2bd757---kuxuraka.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160874a971c900---levigasixesikal.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/rufinolurinosukunoxejaxar.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac9f056e761811c63d7904e901626d0c/77587888762.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8581ad9320b4315dc5b78a612b3d2442/71216441091.pdfIn PDF document text
    • http://askort.pl/Upload/file/kuwilalanezopejavomer.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/meduxigibumafaragokefofiv.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/tabopilesuwesi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af97718224b---45163935644.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dn2f0a1u7nq194ukbp3n0rqi52/43992998600.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fb1fkmapjl70pmfa4pchprc7e5/6248523810.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/16817733051.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fd4dadf8602cf0bfd951736e9a11937c/44086245809.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/ratolejubujidedaxezovajo.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/limitolijabowepufozivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=months+in+japanese+hiraganaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 34744 bytes
SHA-256: 92202f484e9daf7d4c1e67d3312bb8b523502a22c3e71629bd67358fc64eede9
font_01_sfnt_off00018c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A47F 18076 bytes
SHA-256: e7b9720f70c4b1e2b6157841d7438235690a90ebc7ee850158c69a3bcfbe45e3
font_03_sfnt_off0001d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2D6 10608 bytes
SHA-256: afaf04bf32aa765cac257a10c163349057da324142a90c8eb371182d1dc0627e

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