Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2054c41f08c4ac…

MALICIOUS

PDF

84.0 KB Created: 2021-07-04 22:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95e179743169b8ce2f4d847cc3005401 SHA-1: ce965b2261390912df9c7d8a9c889e9cba8ebb37 SHA-256: 3d2054c41f08c4ac4c6e46719e9e51e5f305e8007f2fb9d74a475292dc8c8d08
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 WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://chieusangducphat.com/uploads/userfiles/file/50464857358.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/91a0posataa2ieh9krn2b6mm4b/rusofitavunerisoduwekataw.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/72762084219.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/fijipafuzuk.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/vusebabidomifum.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/bozidawajase.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1b61b5ea17e5d97e1812d69c624e10fe/topoxisedesax.pdfIn PDF document text
    • http://stroi-sistema.ru/img/73742424464.pdfIn PDF document text
    • https://aedwea.com/upload/foto/zazugafozaxa.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/mesamimav.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/fobusipetapusisetogiboma.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2659d4a690---sudelanavugojirukagef.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e354f520d5f4f2e8e5db46f1608d6b54/47497018219.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/rejujegoramexive.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/tolavaxebuwekemulepobatix.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/74adc4md4tn3gblkanij371pk9/96500682638.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/49smmfehlgbuse65levvd42ib3/vudox.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074242389867---12189477855.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb2b5ac9e---5401501961.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zolelozatunawozitaderi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a1c56cb6---nakababewadalaletute.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9c07bbb01b9e460b1368b77dcc6301ce/84206928854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=necrosis+of+skin+tissue+resulting+from+ischemiaPDF 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_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10952 bytes
SHA-256: e057a70aef9c35fe98b21292d83f9dded1f91de5403c9733f2c10b394051c7ed
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 17204 bytes
SHA-256: 3cab87015c49effaba96b7ee1d641c3d9fb488ce6ed538932e492150f4dcce50

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