Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d6f4bc0c002d97…

MALICIOUS

PDF

86.8 KB Created: 2021-09-10 16:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b6590f8c93bf069578e75c07d031de6 SHA-1: ba6ab673b5d724d1bd6209070943b6d859b1c062 SHA-256: c9d6f4bc0c002d97a1b63e1475312410a507e4a2b197daef6fe8591120f245fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=golf+star+apk PDF link annotation
    • https://evrenmentese.com/upload/ckfinder/files/3431654519.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/u8iuks1u46eq902pj8o19e5u33/96385383998.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/tagogofugugasewopinexo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/19de46b3066ee21265f547ffaca48477/kalofojomexutevux.pdfIn PDF document text
    • http://ned.ru/uploads/files/25784297973.pdfIn PDF document text
    • https://aashianarealty.com/file/52793200312.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/nigij.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/67530106016.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312691b8d98---makotizuwimemebovixeg.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/97173794673.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/karubekobixif.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/49090385981.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/71884310241.pdfIn PDF document text
    • http://industrialdevices.in/uploads/padananazovirisojobijunob.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/molinigatopi.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/zepuwenejenafu.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/97003974478.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/2025949724.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/muviwa.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/gikaweliviginax.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/vasaviwotuxaxadug.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210905084258.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/8045991186.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/35931166769.pdfIn PDF document text
    • http://allycatering.com/userfiles/57861649210.pdfIn 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://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_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 10156 bytes
SHA-256: 4e312d387ef9a941fc29e4f8b3f6ba017462128f0e3dfafaf9232997fde1672e
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 21292 bytes
SHA-256: e44bdf60ccd77108dea65062f4335e6df0ff7fb69519a88866b06d64f84a2246