Malicious PDF — malware analysis report

Static analysis result for SHA-256 65511ba7eaf2fe6f…

MALICIOUS

PDF

76.0 KB Created: 2021-06-14 06:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b0eb288084447ae37d281f2bf330ac29 SHA-1: f4bf4a513f78bd8b49957512218d401489947eca SHA-256: 65511ba7eaf2fe6f6c04e97245f543ecb38ab94a7a73e29e70e6adbebf073bab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF structure and embedded links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=cultural+setting+in+literature PDF link annotation
    • https://brahmagnanam.org/fck_uploads/file/lakagimopuxamapeni.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/rv3r4f8l5vl7ndkel0mi12mkvr/finajubagubopozivigi.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/wuwiwiweruvigazubazunajo.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1d82b7547c41ea8c2259b9ac3b057119/vuxilo.pdfIn PDF document text
    • http://charivne.info/images/file/suledibujugero.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160874dcc53f1a---77271209536.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/80556221718.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609194897e2d0---27092692755.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0ad33633e6b5de552ef6b86a251a1752/dinepuxumegujutimuvevej.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lebajizinitawir.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb503a1793---tarobanogubon.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf55e77ec---tovifidadageluxavoxumuxik.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/07129f9dd2d8009a6d6fa969b6e0b0b7/bevob.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6d743907f8144d4cfe7d3c44a7e8fd09/45610305759.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/eb51357820e8aa8edd6e7a363a1c2428/wularitilutakaxulubus.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/274999264.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/juxokupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 4760 bytes
SHA-256: b6754d7cc31636e8fcf3681bb590ce8b622732666cb3d720a7f78f1ea71f5f3f
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 11212 bytes
SHA-256: 9a4206196279af27e55459bbfba2d2147ef61472de9c3aaa63ee88b185090e99