Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6bcde3ba7db66e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 17:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 246ee20395380476e197f3ed08de52c7 SHA-1: f202642b43a2139b113520b810e7bd666ac38ebd SHA-256: 9f6bcde3ba7db66e1ded1bb1fb947d946d79cbb7c5520b1a130632a0d99c5a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=english+reading+test+pdf PDF link annotation
    • http://fotografieindex.nl/images/uploads/99506646769.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8cb4a0fb00188f0d74317ca4f8c93b52/zuxoziporunedetugij.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-6/20210906072150396720.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/nakugabonesunudesafoti.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/21880931679.pdfIn PDF document text
    • http://dsagco.com/Upload/file/13700569493.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/8336647685.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161360a3151251---fominugivupuvimug.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/wowinojijalinokowileg.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/47329451837.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/33440859837.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9etnhg7gh7s71i6oje8mcahm2/kavunabokirifarifonisad.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/26924785019.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/68911980646.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/dejujuneveduzabem.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132395d62a9a---jasuzeriro.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1bdbc28188ff85bd4b975897d152481e/60951255206.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/81239876123.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/sewupijawipivusi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ocptlnve2gj8eo6nr9ipqjfdbq/83990161931.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/dimozezegizom.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/71488541531.pdfIn PDF document text
    • http://www.pvvc.cz/files/3496711678.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/21920767478.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/pubazoloximudovuli.pdfIn PDF document text
    • https://kokomanis.com/contents/files/30635215194.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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 18636 bytes
SHA-256: f4484f4be32fc81acdcef6591b93826f66b49fde390aa93d69551c7f9d4660de
font_02_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 10640 bytes
SHA-256: e8434240f9fda06f442f2a30d953bd178fc2219839ac92d46b74cdd46ae203f7