Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3f2cf339fcc2c3…

MALICIOUS

PDF

89.8 KB Created: 2021-06-29 11:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e867d30fa10e843c1f000b78feed3cb SHA-1: 156de194624001f001cb1424c8120cf596fcc7d2 SHA-256: 8a3f2cf339fcc2c351ce9bf6cdfbee56036b34e9d26098002b8454422e4fadff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or SEO manipulation tactic. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking or directing traffic for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098321a656c3---39176931057.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ttcbjj8mhaup1uvjuu74tfvu4t/72549244509.pdf
    • https://motelandratecuci.ro/userfiles/file/88409962399.pdf
    • http://stevis.cz/files/file/15715090926.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/21535525275.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/hcfhf7iaqee06scv3pjkfuani5/51994362197.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2e3cedca0c50e77469340c2f25e5ff6d/nukobegej.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jln5hu8bp9pkdr1um2fsi0lgk2/sozezomalobowivemunisumi.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0d347f1a---larurilisufewaralekiwi.pdf
    • http://jjmcp.jp/userfiles/Image/file/30954410417.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/plengtridvra760nbnailpdhu3/bufosibesufokuti.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e93d2ece9---zijobudimevuxupugod.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa96293517---60808004067.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a9426d986---migagaragudizovemumuzipis.pdf
    • http://beveragesgs.com/userfiles/file/4613780549.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfba90155e3---lavenisal.pdf
    • http://jyjwqj.com/uploadfile/file///2021052417454827.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7miaprf2ht2edhepje00c3iopp/83755572955.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82218b2ca---suvaxoxibiletegixikema.pdf
    • https://hmanagement.net/userfiles/file/34834937824.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/95904748594.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3b24c4ec358a1c110db53bbab942e5f2/rixulalaziwololudem.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/l25hk48t2mqs72v0e10dfgjsgl/27463919400.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=country+dance+music+2020
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 16792 bytes
font_01_sfnt_off000114af.bin
7ac4acc4673ae24bbe3ec709905df82955cc7f0a394c0e31f21cc7ddd1471922
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 10972 bytes
font_02_sfnt_off00012e4d.bin
4553243338f63184f288a6acace411928a2c7d1b971f89213057c0d42497d2ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 16888 bytes