Malicious PDF — malware analysis report

Static analysis result for SHA-256 a248828ae86a5bcc…

MALICIOUS

PDF

87.2 KB Created: 2021-07-31 18:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f62668af89945a2910ed66d03494617 SHA-1: 79d15f53e92e3212b942720aa5358e9ca68f46da SHA-256: a248828ae86a5bccfbd0997a9b58d895f41e204c67c334620578f2245c198862
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of many external URIs and link farms indicates an attempt to redirect the user to malicious content.

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c9482cc12abcb2ff193d1fcef71c8f3d/18569267998.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/202a28dacdfae7f617bffc211d626dab/43416624957.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kvpr7rh88rbrksi6d4fdjv0o89/vivexokovofevama.pdf
    • https://digireg.it/upload/fajoveb.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607968436a09d---bagemufe.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kne1jl0jbgeri2abjgd5nrnbp1/94070161118.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210702144913.pdf
    • http://gfhs1978reunion.com/clients/56625/File/62829629715.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9e0d62eb87203cd6e7a981f90745f7b4/26009316639.pdf
    • https://eravukappalpalli.com/userfiles/file/pulinuro.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/o5pa3ars3up8mj629qfm5fkpg6/58697913617.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609df98e73961---52274866018.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/dafuwalopipogafopodu.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c858123cd7b---21736886329.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5755b06f71---3563187814.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ad1e2d9c6c5521155b274cb28fc364fd/sijogederelikoviriju.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf230c8b40---52475540999.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/66057325aa9f85523ae18d59dfbb3c36/zibowexidatoserotike.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916dd54f31a---vezukawatesuloxasi.pdf
    • http://ventilatoryzlin.cz/images/file/38493604932.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f2502245---ledizadevezaw.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa4ea68b5---guguki.pdf
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/89280991701.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ltmcqlm0jfb7kd5td0bmsk8v6l/daradijemetanoxituzoda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=financial+and+managerial+accounting+information+for+decisions
    • 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_off0000f3bf.bin
039031b672a502c76a94e79534d18208ad16036985b27a12a46015ad13a6d635
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16056 bytes
font_01_sfnt_off00011cfe.bin
8606a2e1d7342b70120a44210c8f14c934c2ab3f72604c4827f94009a9f4dd0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10896 bytes
font_02_sfnt_off000135fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 16792 bytes