Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73d4b33c3d413d8…

MALICIOUS

PDF

89.7 KB Created: 2021-05-08 10:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c084c774ec118b5853d1842451fed84c SHA-1: 0acd11758ff86e6da922b14e928727a9db256103 SHA-256: b73d4b33c3d413d807a147a6e5300e043cc8be995824d8fa7931f5ce609e5e06
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing or exploit delivery mechanism. Heuristics indicate malformed streams and a link farm pointing to compromised WordPress upload storage and other potentially disposable hosting, suggesting an attempt to distribute further malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://kondicionery-vidnoe.ru/upload_picture/file/60512934603.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e0cd7876---ratikojelezawabajapoleso.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/aeaa567b7cbd514f0c7654cefaec61f8/40858908290.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/46600189347.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce901b4c0---56190418616.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f116983b---nulevevux.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607864bbc235b---368189112.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/944d8b464897e93fac0f40dc681a6ba6/88283452667.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d6235be058ae60f5875582e3bf306997/debabukowaxefabavota.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3fd9850a---pipen.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aa00c97d0ddb8210388ddc226248c064/kuraxuvimitar.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5586bc912c6c23a3ddc806c289009bdf/pimiweragubewerevisusa.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/pujunipasu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/95318ec31f92749e8b0208d09149a954/90271473163.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/90b8bcf654ec022f0e02cebea083f94d/zizowibow.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/81008752909.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608381e7e4d43---rimugagegupoko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=whatsapp+status+in+tamil+hdPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 5116 bytes
SHA-256: 3d704232972e62e3c50702180ec2e5051290208a37b675fdf7904ddf57a18c24
font_01_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 10324 bytes
SHA-256: 312054760d442555a21ccf94f31033072c6e60d091a36a589f687f22739f909b

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