Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f12898883383427…

MALICIOUS

PDF

89.0 KB Created: 2021-08-14 23:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f10797a4bd4cad0927d6d08ff0d3246b SHA-1: 3124d3121f185a9615001ba3232a8a8e690f531f SHA-256: 9f12898883383427bd7866d13b8c16247814b23d08b60123d76b71296c0e8d01
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters in URLs points towards a campaign designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/uplcv?utm_term=mole+conversions+chem+worksheet+11-3+answer+key PDF link annotation
    • http://planbmedia.hu/files/34074990516.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/4730339420.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/budawurugasu.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/liwaj.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1b1e81e4b0dc04ee3270496ca66a1bed/78197134666.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/10833904979.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/lijowadokevakaxozif.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/jubozowonerosix.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/umirhfvlr9m3sufbmdpjrka65t/237528092.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/88200526445.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b542f39be058a6fd84c74c3761f3d602/62455352891.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/11c48430efa5dae6bb8eeed404638299/80877115935.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/44l1shtio5so8sac1bc7dfcfa2/34922577366.pdfIn PDF document text
    • http://armanetti.com/images/15655883238.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/24663475867.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/80451691696.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adac0bb82ba---safakukozigepifaxor.pdfIn PDF document text
    • http://apvn.info/userfiles/file/62431790427.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/bd00c5e90251a591103146ba32eb9af9/volilaziporujiseje.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/suzaferutelofuxobuvutupef.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9606dfde0---3337835175.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/0mosjog3lg8cdfe76rk1rma6v7/rusakojike.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/mepefitorupaloxawavam.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b126be9096---naniditiwuvefikar.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ef08edn4epc1rcpakh8sc6k9oi/95474084456.pdfIn PDF document text
    • 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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 17988 bytes
SHA-256: d2017481b263602e8c6cd0191b7b1c4de0b9045629c884fff89b002ac27c41e9
font_01_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B82 11104 bytes
SHA-256: 3a4239d400b03f83cc8b95db67cbdf7e1e7b6d893dd1e0c0a3242dd2402af5cc

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