Malicious PDF — malware analysis report

Static analysis result for SHA-256 0764f8b9e036e6b0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 22:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05e557b2ad0ea55c0c030d4fd4a1ca0d SHA-1: 8d56d9bcc593e8f358da7dd3786c7cce4b8c92ce SHA-256: 0764f8b9e036e6b01f18b32825f878950ebcece07fa652422f224a25caabfc86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://commune-bourre.com/userfiles/file/wikisoma.pdf In PDF document text
    • https://ksboutlet.com/file/files/rarisuxanufiwugosirumex.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161333b2e6068b---57372524058.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/30278118925.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/97551888898.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/volemirakujopide.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388d4d7d888---42446958102.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/9519813578.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/bamiwa.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/tibomogu.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/mamivuvivapomezolipawig.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/dinidig.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/gufiwevizodivel.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nukudibijekiwujinige.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/xugewozevenetezerig.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6949422a---xisujifizoratawa.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/bigirigubudanuzebiku.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/97490879359.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/62059998429.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/33611677944.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/puwob.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/fevakoduborineriletime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=finding+dory+full+movie+in+telugu+movierulzPDF 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_off0000c703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC703 10684 bytes
SHA-256: 543dc52402078e680effed5ece5ed19ab58959aa9b5a467390ef26a05e37fbc3
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 18300 bytes
SHA-256: bedd968eaffc17b59503a032af1e24f05bda81897235c972392638909c357596
font_02_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1