Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b73da7f976ba550…

MALICIOUS

PDF

80.3 KB Created: 2021-08-29 13:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aea1c3d6fb0090d4aee11e9e63f4b47e SHA-1: f75b7378d11dddb6417ac69d95fa8ab35dbba6c2 SHA-256: 3b73da7f976ba550432badd04d203366e816132e2e4ab2eabd4fff0062f2b710
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to obscure the final destination. The ML classifier also strongly indicated maliciousness.

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65de99b6b2---84773374056.pdf In PDF document text
    • http://tianlanlawyer.com/filespath/files/20210824225320.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/20328201234.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/26909708472.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/65948453495.pdfIn PDF document text
    • http://jucal.es/images/file/luxirajapitesumire.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/doduzuvuripivexebuxij.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/041400bd1a7304d6f93e6057b1f973be/tusijarepewiwutajoj.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/prg1etn41pinb3h96hdgfsgpm6/pulaliwesumar.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ffb5776d---94970238532.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/54252bae998b5c0c57c889f597b1f7d9/vitedopetenifukeb.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nosuw.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/48ac7888ab503c1125694ffdb6640c09/letopefupepirisek.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qfa2o1ltgvmm9537ildiflfsoq/tedarakonotofibalog.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/63474323322.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e41d5a22---10521019204.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/tawubis.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/21950767351.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb3303846a---tevuram.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/97514827497.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/23193013057.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dd684f96ae2---patozoxibozagerasal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=oregon+unemployment+weekly+claim+line+phone+numberPDF 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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 11208 bytes
SHA-256: 0976f2c6ac7d7aaede87eb7175e66d5b190067a4a09c4dea86653a25756a673e
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 18008 bytes
SHA-256: a0bb5645f1af3e3b733d213a2e95c1f43c1c73f181e392d9e1a6235ee8242fd9
font_02_sfnt_off00011b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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