Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4c07f150a77475…

MALICIOUS

PDF

89.0 KB Created: 2021-09-15 03:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b3abb31e6cde276e868fc54eb64ac64 SHA-1: b7171e6a3795f9491ac767613300b0d2028c3710 SHA-256: be4c07f150a774758ce2e5c8c9e3a523b3dd8c2302f3162da905d03dd56fc99b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to redirect users to malicious sites. Heuristics indicate it functions as a link farm hosted on compromised CMS uploads, with numerous URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=how+to+update+galaxy+s4 PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lh4uds53nbpg7l66qkojvmrh0e/paxesedofalixovavokidax.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae6949ab0---39032962251.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/48756056968.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/10798607251.pdfIn PDF document text
    • http://tiquital.com/documentos/file/58329886722.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/xapufejetoputadurozejajef.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/4085058578.pdfIn PDF document text
    • http://nemalipics.com/jaxujobosafufevitafizi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1f54d9a2ff629ac23285a6a91ff761b0/94023080174.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/59419020185.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/tesepupaxeruxolomix.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/25255397826.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d712af08---90110207135.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/zabeniwaroxotikuwupiso.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/notebojobadonefufosafu.pdfIn PDF document text
    • https://asken.as/bilder/file/82829565564.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/93877347011.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/57362062536.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jfn9e416ubptt2qkb2umr95trl/mafilelamavabopa.pdfIn PDF document text
    • https://tadimtursu.com/image/files/21190705214.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/88008549923.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/64528064527.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/84620770061.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/17961974298.pdfIn PDF document text
    • http://dmkert.hu/files/file/28317969029.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10740 bytes
SHA-256: b1045adf03eb154abe3ad338bbf86afa24e8868f1dbde48f7d31620e963c5e03
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 18384 bytes
SHA-256: 55a21054c79f599cd14dfc8c71ffd157bfe751bc745737fb0561a2e17a136798

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