Malicious PDF — malware analysis report

Static analysis result for SHA-256 38415faa5f47fd8f…

MALICIOUS

PDF

92.8 KB Created: 2021-07-26 12:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2837f914d82388b93bc8b02b13f2403 SHA-1: c2808e93c6fccfaaef64a0bb5806f45c8e4d1ea7 SHA-256: 38415faa5f47fd8f63e710ffa2e9c5bd1827f5260c450149c152da4fe61ddb29
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to various PDF files hosted on compromised websites, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7f115b5d24ece2b424a6ddf8cd0fdf77/78028360390.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08a3531173---dubojeguxor.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/bosapinate.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cbe97fd14---zabusumex.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792ba52901b---xasixexuzidesa.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/6669650202.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/72785117774.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b6e9e152---71418724835.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d4cb84fc---nuwalibes.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/49998139776.pdfIn PDF document text
    • https://thepainter.asia/upload/files/mezuvajotafuzepezu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/pijivinarobagori.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/wulevumoben.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/ravivonumuvip.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/92380548141.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718cffe4145---14555784919.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/nasukeduxaginaluba.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/52046477184.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/zugujewofabedajo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216394478123.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/ralavimadebepin.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gobebekedisogeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pakistan+general+knowledge+questions+and+answers+pdf+downloadPDF 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_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 11100 bytes
SHA-256: 74abf7bd59b555de39264b53a104b1a238af356a8755055fc1daf6ef567f9278
font_01_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 17384 bytes
SHA-256: a3d139cb8d1e6187661a29c422b8aa205df5cc3e2209ea092df56ff8b098ac2b
font_02_sfnt_off00014be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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