Malicious PDF — malware analysis report

Static analysis result for SHA-256 6938cce4b4fb4662…

MALICIOUS

PDF

83.2 KB Created: 2021-08-14 10:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83e3769bb8576e14afc4b44be5fe12b4 SHA-1: 5a77fd1beae7b2ff19540ca853b33f8def6cba64 SHA-256: 6938cce4b4fb466242f6b999d44ac2da9de2b4deb6ffae62332f83bfcb8b063a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alkathirilaw.com/userfiles/files/kotusiwivev.pdf In PDF document text
    • http://kcde.kr/userfiles/file/jemojaf.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/85295349681.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/zevigibonu.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/tijiwimiwikawonoxozufibu.pdfIn PDF document text
    • https://activepymes.com/pub/file/80840564391.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/60647231076.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ee3156b0ec0afa77d4d6e1d9b82ea171/35253099588.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/vajoxekomakibosefevud.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b6b330e4be5615bba86fb10d286e65df/natefemewavofizijuzi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7a4af60b---45512057839.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/2558858940.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/kesibelibixekatosoxe.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/rovagokosobilajagijijuvu.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vidamaluzerud.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/waxak.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/visamigulamizuzagujefiw.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/qbq7vtkdseh9on62ssgfvkouc7/3457930988.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/46404891954.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/jawokamonanulosizisu.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/nakojek.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/kedevanasifujujokegotiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+does+prefix+pnea+meanPDF 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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 18920 bytes
SHA-256: 320cc1fe10d1280a38340bf4d910c68664349bc1fb58fdd34bb2f340db9ba946
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 10812 bytes
SHA-256: 1c08049e014cb838fe4c7f22d67af005dc0c8bac6ab6208c5d3344ea1cdc210d