Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49caf4a367c2f8a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 22:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 259fdfaac435eb768b9c26e873c24d37 SHA-1: 7dd4d969f1c3a1f568c8e1e99faa1d5b6b9b3733 SHA-256: d49caf4a367c2f8a9cf900414b72e55f751c0be5c7ef1cb67b8007862aeecbc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://izr.fr/files/dofegiputonusox.pdf In PDF document text
    • http://eraldocomo.it/userfiles/files/15689515691.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/sevukazowaketomaki.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/99430483070.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/69215056642.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/lojepof.pdfIn PDF document text
    • http://newworldss.com/uploads/file/58084962671.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/67466994620.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/92257560535.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/tezale.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/wexujanozedoxixa.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090612364973499.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/xakujenij.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137da3c58022---padivatapi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e090ac35b72eb05fa82adaea9c9f9e1f/tanoniwej.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/25396450197.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/vivemaxotapij.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/7665973666.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/7551575789.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/94521174148.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/48399079f22b2ca97036548b7f547609/sogomizekegibig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+open+unlock+phone+without+passwordPDF 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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 10880 bytes
SHA-256: 4eff3d62d67c5b5f19c3584ae148483c4b389ad804a644b1eb13d41a045fc4b4
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 18392 bytes
SHA-256: ce4a4d7919f982d4908d199c1f419512199e3063df275c8b34ed6f69c0dde55c
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1