Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec22f85fb52f4656…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 09:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5656e8bec1778c5a9ebb9b70e80e68d SHA-1: 3ade86864f57e2c5262ef63923bdde674497273b SHA-256: ec22f85fb52f4656ac3d381b10ed97bae1b271059739622d49041a154e968e00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to lure users to malicious or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a link farm used for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d98ca4d2e388d20a9f3fb8c21db84486/43081999075.pdf In PDF document text
    • http://zenobiacultura.it/userfiles/file///87499995353.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c039b96039b---75455169672.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/zebenupebaze.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/477931537.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000fffd2a22---pubuk.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/vogasamuxejefatew.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/likuw.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/nalaxutef.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7c6aa9e9e44d09dad8963851350e466a/21041635352.pdfIn PDF document text
    • http://come2menorca.com/images/file/wosurawewapo.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/doxatupopuxoguxulob.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/xupokogopite.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/471af3f7823dd9fb255a387e68e39d60/6798994997.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/88269717021.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c677f1dca---90495616144.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb308803ba6---80201184689.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bbba66e9---rixaradusibabeme.pdfIn PDF document text
    • http://sparkpro.lv/content/file/jidabemol.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/fematu.pdfIn PDF document text
    • http://artside.org/data/temp/file/83229206649.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/koxejipodotabugifojutapa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hmbllv3h9mh5v3alrti8l0u5i7/gomavedugenivopamusewane.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/wigipejinavojoxixisix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=always+lynsay+sands+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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 17376 bytes
SHA-256: 05c18faa8be253d237a73b2d9797e4c7c38993239dabbcb56aa08f444391cf28
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 10132 bytes
SHA-256: 6c5978a45c3f2a0bfedf08985e55c2804f6ea559a78025bfae3ba93dc77195c1

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