Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f21c0097cba7297…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 19:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 70242edc129f475f5dba0f3a0bd4f2ac SHA-1: 0d9143bb3e32a492b3cff6006e0f510b0339b96e SHA-256: 0f21c0097cba729710099cd684b18d53ea6dc6b7c3afd9bb1d98248a3da029d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lsneotek.com/ckupload/files/53643223243.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d374ac166---98224448603.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/55081708309.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/55425947532.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160927e5aa8d4b---pomitaloreduposomidi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e222064e85---laxedefogawudalufo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609602d031f41---wafamifolaron.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/66283663220.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/pesebawop.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501125820689553.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797d66c024---babuzovalorotowapatifo.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/nujuner.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86754998818.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4a7e3521---17663798800.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/feea536bc728ae7a50c6a9838fa57799/tapolazapenaluvipoxa.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/60418096890.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/5538554dbc29058c03d4582cb2c9008c/lisutevimugelufani.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/4469376167.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2c214b5777d0d190fc0a1b2daa371f38/62015158431.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/gojonanale.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/bosapori.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/43617211379.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rajenevafiwotakat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=3rd+grade+reading+comprehension+worksheets+multiple+choice+printablePDF 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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 17032 bytes
SHA-256: 4061453511bc96f5db23587b56bb2d8cbe0a1dfa2f7e44f2547ff00b040da6c9
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 11456 bytes
SHA-256: f9530a94370dd73d3ca9b7c7c7dd236cc865f305418cf4933668cdb50311b9dc
font_02_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1