Malicious PDF — malware analysis report

Static analysis result for SHA-256 714a9aa9f7255b4c…

MALICIOUS

PDF

92.5 KB Created: 2021-06-23 19:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3db2c7d01ff1bdc7a89a57acc511e86b SHA-1: 9a6dca95beecb9a7b81aa8fd5a0015b85b32c4ff SHA-256: 714a9aa9f7255b4c38cefe93bf95a36bee9bca806ad6259f0bb06d944ed3dcd5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

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 http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e41e184c1b---pafufivatarokugo.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859a50a73b9---56446851320.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/81b5975292da33f98d80cf46e9dd3ffd/56533967464.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/bobedizosofanazoxagixep.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/sobugukodukefojeb.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/llh9m6t3tfvsu4meffovuj9la3/85113752068.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/64588677611.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7415b6f1a---guwusitorusexi.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6up9ff766dfhumpbmto4gcp6ns/notukivefin.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/51333622655.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/33738429820.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04606a278---68063019784.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c162560aea---gajudedizetabikodakuwo.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/dekilelazipexusujigaf.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e04bef3ad2e4323ab1d10fad1a6f5aef/52577954896.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2ficko2rm6m426qhek6j5qv63o/davitanizego.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ce91dbe78cd8701d3b9dc64847cc01de/37604448966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=marathi+shlok+with+meaningPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 5260 bytes
SHA-256: 7476c9231d9f2c318e412fdd4fbecdd59b9a171f95f1966655d0c770cc9490d9
font_01_sfnt_off000141e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E5 10236 bytes
SHA-256: e25cba7794ecf0bc4b5affbd5a9e7a8c8105a4c6c15e0ee704b35078e8143984