Malicious PDF — malware analysis report

Static analysis result for SHA-256 11516268a05f5e7c…

MALICIOUS

PDF

81.8 KB Created: 2021-07-05 20:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6470791f9562d2bf526757c5258bc107 SHA-1: 295ef5366f0eb06f844b27d717f9759868e7f9cd SHA-256: 11516268a05f5e7c46b75fd5796f42fa73c2b8840b58c2527003fc0522a17602
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/cf6dad327f32f9c9059d56c853be53da/12238620125.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/87a4efe7dbee03c1db14eaee744eec2a/53962988530.pdf
    • https://supermagnum-bg.com/userfiles/file/lixalawelivubifotuje.pdf
    • https://fotojursa.cz/userfiles/file/2180933167.pdf
    • http://auksozvynas.lt/userfiles/file/pizuwaresemetanezuzenaw.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/durfp1trjmt1i4ud043905hid1/wirubexatupogowivij.pdf
    • http://nuraski.pl/wsg/userfiles/devipo.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc4f88a13---97238322147.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa643eb61---37007162591.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0e3c4548---nelewolipelabejij.pdf
    • http://train-in-japan.com/images/blog//file/48030483427.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160892b606c00b---98897537326.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/c1780e3919dfcff4ee9aa43fb32525b3/20037143072.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607744120eefa---polefetiwebepuluwule.pdf
    • http://biosite.ru/images/news/file/28290853357.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cc69a784e3e672d7f73b490926906857/65029291158.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ae76aba3---77433962956.pdf
    • http://i-daa-wl.de/userfiles/xavuno.pdf
    • http://stroisvias.ru/userfiles/file/wojosav.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/68376364041.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c5eda924---lakimivaviwazomep.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2e0daaf2a517ea284624406569e1ee8f/91113161821.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=perfect+dippy+boiled+eggs
    • 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_off0000dbe5.bin
d9ec32291b88b42b1a960df68bbf254bd9abfb71371ff6877f69c9ffd8b6c65e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10784 bytes
font_01_sfnt_off0000f46a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 16792 bytes
font_02_sfnt_off00010c7c.bin
212bb66ad303f89808f838a7c8039350b86f77949c069b65d5ff779c80accbf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 16884 bytes