Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2188ecee1cc120…

MALICIOUS

PDF

73.9 KB Created: 2021-06-24 06:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bc8e23a3be2fe9fcca0e7e7d909053d2 SHA-1: 4ac9b480dc9b523ab68ea65992af3f491975b469 SHA-256: 3b2188ecee1cc120115a542c0cbcf89892f8d39f9b30a3b6979d20a360a565c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://oniceh.ru/uplcv?utm_term=travelling+grate+boiler+operation+pdf PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3006735520---mabofavugas.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35fba20bca---vabug.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/54767079125.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8b8ca4d1---nixexufevotazuvu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752d95c5508---57451604597.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1156159528608abb4168fd2.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6f1cf530029eeacb9900f45628328a46/mavotomivimevelu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8ua9fbkokh7osjvd1tc9gnnaq6/diwepix.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/555f9be6ec8062807c2025233855668b/sorugufav.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/94a9557aaf9ebe3c83e427585040bb74/25459557104.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/35810555842.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ae26d6f86---bokulewepuwupolasari.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2baf8915748469ff9b9751ec102ea841/badaserafarezewofaruduno.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/l3li19r770jj2vgp5g0guspa97/tinawosebuvo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/41538320864.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gilugigosokodesisiserima.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f0b6547d---70137043040.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 3028 bytes
SHA-256: 1344297ac3eee8681cffc03e9d761b2735618db301dc60d380d883d09a86db30
font_01_sfnt_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 5180 bytes
SHA-256: 7fcc9af3635a22288afcf486bbf05796c74d33bf45c668922a33a53873df68e9
font_02_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 11172 bytes
SHA-256: fc7c083a4d15aaa5e4ca8ff49bd8e2a84c5a98448e2e76ff581a7d053dae1186

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