Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbf9791fff491e0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 12:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7eb750ba135df49bb4385575f17fb81 SHA-1: 2349811e8268466bbb498be2e16bbfd044e7a038 SHA-256: abbf9791fff491e0a22d80f1a45a07e9c2f5f1f8c3ff459f435a24c1df28a732
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f149b0ce6---vapatalibosezodifajeraver.pdf In PDF document text
    • http://iberia-ex.com/images/blog/file/14498841942.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3s7957jk595hv7ceqq6fuop16c/sititovurezelad.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hg007vh8iptckaq87220tofbss/32025742847.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/jedudivowagodudi.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/xilezuwinupimav.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/76583055210.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/vajefexusokezuninojida.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/76537671100.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/vevowu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/82048567412.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/ravezivaxeguvejikeve.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/xikobuk.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/efdc6c832c3352ee1700477017069495/36137247461.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/58162961396.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/91828168732.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/58281223597.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6b39985b---33094309023.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/72120535986.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/20856725273.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4407dc9d24df41524f629acbc80a3016/sudine.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/gutevazedepef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=purespa+essential+oil+diffuser+user+manualPDF 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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10760 bytes
SHA-256: aa0ae2e26cd8ffcdab8a0cd1b081b2d2fca0fd686d8ee64698d42d8dc1003bf7
font_02_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 17816 bytes
SHA-256: 4b37ef000e6fbcddb82e2525a5ebcec828bb7fa4859c0e83457a3afe7d66528d