Malicious PDF — malware analysis report

Static analysis result for SHA-256 053ee64c3155b267…

MALICIOUS

PDF

75.1 KB Created: 2021-07-16 04:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 272677760489c7b6adc4eaf158914333 SHA-1: ce43c790bd7cdccdabd83f765564da241e10c71d SHA-256: 053ee64c3155b267bb6e459f1914ffb1751d259011f5f260d2c228d68aa6c78d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://presssimayeshahr.ir/pic/file/sukefewagolufesu.pdf In PDF document text
    • http://douzonebnf.com/upload/file///vijowejol.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34f5e361e---kovelategofubapapu.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/12552790700.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/wakerixe.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/61326417408.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608623597a73f---17190964591.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/71897105998.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xaxekivoxoposoxugafej.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac030f854dd---sufirowi.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/93103972898.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/89609047561.pdfIn PDF document text
    • http://artside.org/data/temp/file/84097830019.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c49d6d9ab345e9da82cc094457a27afc/rekamezugatirije.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a9e7a6f14ce07fe40332c6f85617b80d/suridunuloxesetax.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64eff88a7e---nibunet.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8c923bed30889174abf3cf4bb5447664/63310896051.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6be8d7b78c6592d109610bc53a1a15bb/61095125395.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/200834461485.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/juzuxid.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/65666868274.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082d33e5c083---kibabuworotigowezibuso.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d4607621---68964381780.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/33907809017.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c9989277---78566081702.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/jazerupexexuluzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=about+sundew+plantPDF 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_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 15656 bytes
SHA-256: 1b2a352c1e6e0188053480f4e1f1c13db1ad0853f0ba3a8e6180fa6c108c421d
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10500 bytes
SHA-256: 1dd450fa6c2452ea39086f0ecdc8da791c1abe283a72e32d9dee91151bd93e27
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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