Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c93bddac85c1c32…

MALICIOUS

PDF

133.0 KB Created: 2021-06-27 23:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9f479c5cafaff7918d29057bfb46b2e SHA-1: f6b09e1cb6b7fc5ac7be658eb5538652e8cfab40 SHA-256: 2c93bddac85c1c323da595bd74dc31f144767e5481baef8eb202c7a59181cd06
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 ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These sites, in turn, host more PDFs, suggesting a multi-stage attack designed to lead the user to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate an effort to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9152

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://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/tb32o82fpnf7fv53qpefk01p2s/21338093558.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/aeaa9e715daf0fcdefd5f5bf7777daa2/bozikewekabemozaz.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160be3b401fa70---39093113689.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/02a8ebe8cddcbb0f69a2ab82835aa58f/sabamaxepof.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f888fc39e9---34071342753.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722455c7233---78379343229.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722bff2b81c---puwenagip.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15dd63e4f---gelejewunoz.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee4c3c80f---wexarofixorotivubik.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/pdan0f8616muq60unlhf49h1mo/vumupufebagaxika.pdf
    • http://alt-1c.ru/userfiles/file/20977531027.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4vef9234gcb42jmsrkgmo9332t/30294461740.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/409701d41d0774488dbb41cb07de1d20/46450460347.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a397a43f227---ponunobepigawo.pdf
    • https://mimpishio2bet.com/contents//files/fijutoxifesigenogatob.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30f94dd91e---xenumejebafofuwo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/og4kf637t8g2sq33kbe9uru8n0/95698970089.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/aaf9ff8d13dfcf8ba6a013650bcde9ba/gozonexawexenamozifibefe.pdf
    • https://chung-pei.com/userfiles/file/xufovotitujapunarotoxof.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a343b300c---41690374764.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa5346d9b---sunalepogunaru.pdf
    • https://nepalimodelagency.com/userfiles/file/dejoxaterawen.pdf
    • http://botosani.ro/img/uploads/file/67463432347.pdf
    • http://flexa.cz/docs/file/40010523101.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=use+of+as+far+as
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00011d40.bin
f866d60c34f798cb7ae1acf75dbd6af0e2bab7d82318da23066f011befcd2881		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D40 31264 bytes
font_01_sfnt_off00015744.bin
2b194de1861424ad86aee0d6da3378a4e7d7f7fffac2f6f0db6fbc9280834558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15744 17344 bytes
font_02_sfnt_off00018b38.bin
bcf07e1c069dd07312138c4aad9584d1db3124451e853c0b3433c5a51c000344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B38 9872 bytes
font_03_sfnt_off0001a117.bin
2399d0b883399038b1865ad89dc7909aff1997b311a0799f670401a38b2e87c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A117 35152 bytes
font_04_sfnt_off0001ec73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC73 16792 bytes

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