Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3c9a4e6cc3056c…

MALICIOUS

PDF

84.4 KB Created: 2021-08-19 22:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f79912bccea7d122ed7018a9fbf31f8f SHA-1: ce6948e7309fdec5c42d5a49a961cfde8b69ce06 SHA-256: 7e3c9a4e6cc3056c461ce2b3bb60cc9cf01ba55325c4a9bac250ad47f14ce35c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The 'Fake invoice / payment lure' heuristic further supports the phishing attempt. While no scripts were directly extracted, the presence of embedded URLs and the overall structure indicate a phishing campaign aiming to trick users into downloading further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c865020bfc---faxemo.pdf In PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/mekiwuw.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/gupoxikudijota.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/25685349077.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f692d794201bc713becc0c06d0649624/rejib.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/79150612773.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6f1197f98---3748186424.pdfIn PDF document text
    • http://universitecentrale.net/uploads/FCK_files/file/97841757067.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/209092dc04d54f4cede216b8fab19ceb/lamokatamizigowunuge.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b28265a3---24015123460.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/18566890880.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/47607907379.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060402292873499.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/27179629968.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/85846181444.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/495a5114fbbd73be890aeb0c913f4162/83007434304.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/wijusonagodujibifirexemol.pdfIn PDF document text
    • https://mauspro.net/upload/files/49654956140.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c1d902bc46ec9913abfca33a48c249ed/kasamidi.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/semuwelenuresumusurumipi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103355f40245---84590512438.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/66208077048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=echo+and+narcissus+commonlit+answer+keyPDF 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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 11012 bytes
SHA-256: 273a71ca1919e7d44b8b2d7822488d9441d036d4714150a61069824f7f62eaab
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 17256 bytes
SHA-256: 40697cb090ea7ed3399a2f1464c4265696dc1aee983ae14e96105317a5fc5e7c

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