Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a3607b834630db…

MALICIOUS

PDF

89.2 KB Created: 2021-09-05 15:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3a87d32139f71b8a126aedc6635c3db SHA-1: 9060d196d6ea5cdf8a878b0eee2ad8c0d90abd7a SHA-256: 79a3607b834630db288ddbf4fd82850b0010f878fe069570a39d3f3d41923c17
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=post+cardiac+arrest+care+2015+pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/15856458419.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d47eac94f8ba151cc66a4b0d7614bd9/fomatuzisigogegipozopados.pdf
    • http://linkingpeople.info/userfiles/file/50134469723.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3797a4e2a---zakirumikufebuveper.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/97916c42af623345931a1099883feaa2/73188480310.pdf
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/66824611122.pdf
    • https://i-intelli.com/ckfinder/userfiles/files/78827385132.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/sajale.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1746bc1de04dd9a8feb5d80da47fb34a/83595293120.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/4a8ad0f4116608f48bbd9dc7df867801/vixonilujaketexe.pdf
    • http://cmtdental.com/upload/ckimg/files/59194049821.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087599472dfd---juzisivutexuber.pdf
    • https://actor-conseil.com/files/file/77861174721.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3cdb74d61f90746c7cb23ea7ae9e9858/54467774169.pdf
    • https://alnahamgroup.com/userfiles/file/lotarezofisuzo.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/repasejufozirivirojojul.pdf
    • http://banhangcongnghe.com/upload/FCK/file/6765460378.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2743f25ee5---tebilugesevawokepopa.pdf
    • https://sanaspinler.net/calisma2/files/uploads/82345359060.pdf
    • https://mytekas.com/UserFiles/file/bonoxenibojag.pdf
    • http://yjccnc.com/upload/files/mijugidizoviri.pdf
    • https://beyondpins.com/calisma2/files/uploads/58193814784.pdf
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i2ib01t4eodioore0shl00qtp/67973204220.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/470c734a26858d047723da8560efbd18/rogevarakanige.pdf
    • 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_off0000f619.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 16792 bytes
font_01_sfnt_off00010e30.bin
8e0c63062e751f7935d62c7e8645592f2250c731a245fd810f243971688fdbc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 10892 bytes
font_02_sfnt_off000127b1.bin
59d67705b43bcefedf704bfc09ea4d5a0763f00f3dc6ac6e17d41117345f9a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 18396 bytes