Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e954df17eebff13…

MALICIOUS

PDF

94.5 KB Created: 2021-07-03 02:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 09563aa528c7c22b2cd2777db878f5fc SHA-1: cff3c94df54c8181d2a440527002e8926122b7ce SHA-256: 6e954df17eebff13e038a31842e0b776ba7243106ebb2c239e2a306cf1ec5efe
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. This suggests the document is likely used for phishing or to distribute further malware, leveraging the compromised sites as intermediaries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=comedy+questions+funny+questions+with+answers PDF link annotation
    • https://j-kowalewski.pl/uploads/userfiles/files/wofomovevetafes.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/gulopunofi.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f88fd081f---18418579704.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nusovogodakorelibonibiji.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0ba159f11c99bfec5046041a79a55249/38755482530.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3o1609kr17ipt13suq6q889780/41879796106.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084c44b35129---67039100808.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/28592276738.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/12662736934.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160840332e53f5---zolizoxetuwobixeb.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f4c16259---48897005276.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/fapatevovadifulijanugago.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7934205d05c44d2827c9a8d8a5c6a19c/tosado.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/tuxotosuwefuxujapesil.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6519d441570ac1c84c8130a301997839/tawusok.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a015ce3d8c---wixinamabobotadezuwep.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157e324806---sufugexexuwewotelulezepu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33728a8619---latipabo.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/77769232874.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89d57a718---nelibunededunesupefumisew.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/58216f4b8b45d415e43be50481e5c230/fosobozoxuziv.pdfIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 17484 bytes
SHA-256: a25010d936d621556915c97a4e8e7f2bf3dae4dcc04dfcceb4fb8f62f5ab567d
font_03_sfnt_off000152c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C1 11048 bytes
SHA-256: 320e6a1f37037751fb1edb0fa4b0ef7e60db9732b22b81606868e745159d0f40

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