Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f1e44b60fbf431…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 07:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43d4e16c53186be0eae9d1960ccea557 SHA-1: 8d8e9f43833d4dfae9604881f6cad6ce950dc996 SHA-256: 71f1e44b60fbf431b684012b43774273b4d9d3dbadf75aa40466aa06d68157fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=barber+and+odean+2000 PDF link annotation
    • http://staresecurity.com/userfiles/file/34011657688.pdfIn PDF document text
    • http://techbis.pl/files/file/gotivewigabibe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/s3hck8aii1so1h227o294g9ok4/456018321.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/nitomobabowemozusan.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sabififaxumatalitinegabo.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/69644050791.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/jeloxupomebasuxam.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ttnja8c14lngu9vn2180r29q65/bepudujidex.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1gdsrfmpa9ircgnm8er67hulp0/xopupinuguwisak.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/63301121725.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e31c6d3bac6---94390128872.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/giwosidirivejojuwesa.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/josukinivog.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/dipovuni.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04a4d1f573---27236963635.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/livabetobusotovunumi.pdfIn PDF document text
    • http://contelex.it/userfiles/files/posivitufipekapusix.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/72f9dc39a7a145ab22f4059cb676c1fb/bivofebitorukovojof.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/27749101460.pdfIn PDF document text
    • http://precisao.net/files/files/bozesagesugebomudal.pdfIn PDF document text
    • http://m2m2design.com/userfiles/lemobevutorenanarinu.pdfIn PDF document text
    • 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_off0000b6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D5 16700 bytes
SHA-256: 1d467f2605b4d1c7a18368f0405caf3aec1dc9dede61606414d22210531ca271
font_01_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 10272 bytes
SHA-256: fc08bc82e3799251fe03d49bd33271a84272f06b9908493a711c09657251da66