Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46be256be511307…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 04:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 713fab0bc2813eb9984cf3693c2b213b SHA-1: 599d3200ce220a151bf63523b7cf53daa6619572 SHA-256: c46be256be511307c3e0853386d8d0120101ac55e6629caf5c3e86950a85b96d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or a distribution point for malware. The document functions as a link farm, containing numerous URLs that point to compromised websites hosting other PDF files. These embedded links are designed to redirect users to potentially malicious content, contributing to a broader attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dab2150e1---gigukazizunipubofikoturuz.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075e32aa8ed2---97852645272.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/dapipegipajefu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vm5fddji2ar09p84obqr0v1d84/28600773911.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hj8u3sg753hv69q82516do2akd/81483534420.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5b6a9221d---belazananedasoj.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/noo73ugsrgt6s1ucgftp7k4cd7/260287053.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/30692549509.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e717a25ee6---guronijazavenoripevu.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/dolapixegurimapekob.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/12876608383.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7a65a2fa809d0a1da61702cadf5224dd/2415771656.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xisejaxifukusas.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/69873097966.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/zuvikiresamokedidofev.pdfIn PDF document text
    • http://henca.com/files/details/file/nafidugo.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/41040097474.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/23015tf403rnt2ubljfiebihhi/1847985834.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73a264689---desolumutan.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/safadebetukubatevax.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/65326533677.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01639deec---fedabibemiburixoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ukraine+call+transcript+full+pdfPDF 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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 17420 bytes
SHA-256: aed91ce75d25217a9917c5e7b68feac085257bea6b59ed06a0bee8ce3b3ee306
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 10692 bytes
SHA-256: 694db14a7dba119b8af01ad2b3ae07cde8adf3ac7e254837b05298fc832370bb

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