Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8427b8e70a91a6…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 16:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90bce2db66744e0a62ed3d5815b40d5e SHA-1: 101c812d346336d7bef7ac5de07c9f374f75818f SHA-256: 1f8427b8e70a91a63cb3c5505a71c64094349031e09b47de669421943c023776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.yevres.fr/ckfinder/userfiles/files/zodidukivowob.pdf In PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/98511002147.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/xubuzukukig.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/58504327239.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/18092681126.pdfIn PDF document text
    • http://opersan.com/file/89569607323.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/fefofizutexuvizodiv.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/28265001000.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/revulakasirizetepo.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/japanuwenolenovomefug.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/vosolokol.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614323c507c05---gezikibifajudewimili.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/zujejiwajofasexasule.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/54802999233.pdfIn PDF document text
    • http://tzsunup.com/upload/tuwotijawuvedowego.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/29536117153.pdfIn PDF document text
    • http://nutrishop.in/ci/userfiles/files/84568523800.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/semugelarexa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf1e222c83f033fe36c12880858b74d1/27665126152.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed8b47d0f---jasabesisufasevoxolo.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/zirovitowagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+go+apk+185PDF 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_off0000be7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7C 20832 bytes
SHA-256: a8d449719a1ae2c5ca985755ee05b368682593b59a75c73f5b395ad1a0b10246
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 10580 bytes
SHA-256: a459bad801ccb97c3286e77087bfae5ff2bb77dbb35f61fe1a8aa642f359edf8
font_02_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1