Malicious PDF — malware analysis report

Static analysis result for SHA-256 2261e4502a150bca…

MALICIOUS

PDF

87.3 KB Created: 2021-07-10 12:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5592937692afdf6c3fb73fcb66e072b SHA-1: cbf5e48ed51362a1588b0ed7921585df5b186ec8 SHA-256: 2261e4502a150bca624e5f3e6aed0fce2cf26f313d042864e102d046594d6ad4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=diary+of+an+oxygen+thief+book+pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a3303bf57---55561311517.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67caa99f46---rixisimogi.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/032c7d588c1504748e23af2d0ea96aec/xuzebekupimuvokep.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608532b713cb1---benaraginitujuwinope.pdf
    • https://farstaslottsvik.nu/anvandarbilder/153/files/fakepepazolowulexo.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2413ed49792eebfc22d93cd935c8f932/4984436971.pdf
    • http://pantipplaza.com/userfiles/file/nozedot.pdf
    • http://evohome.pl/userfiles/file/funum.pdf
    • http://kbchina.de/upload/13280551972.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bcb2fb4138ae40f8406fee8c1112542a/58488938317.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981882db9fb---dikosixopijalukisamewuxom.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e053361750f1edf555aeafc185988c1e/namunipovijas.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/66297545478.pdf
    • http://amuseonline.com/absite/userfiles/file/65866971143.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/kfp7078cdbgctjtfbj98hbs21h/pavamem.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/sgfnc4hbrq7fc9vhifj6vt72ap/20400640710.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e24b0dde---lutuwiwamosunokofezoxifob.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aede1068465---xovidikofan.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/753b6b3a9ccb1427c9b7ad44556ecec9/9659902073.pdf
    • http://goteneplast.se/files/images/file/jepogel.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a817eb18d97---josapifilabe.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd23b0cfc7---53017815798.pdf
    • http://tfforming.ru/d/files/36898713248.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd8840405---54821446293.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/jrgvtvcdvj3hitl3abr2uukf6s/dokodixelodidexadi.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/nuj4pdaelehten5mjojqf8qhkf/negelivopaxolapenubexuse.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/27f23afdec94666271bbb58d9b9d9420/nuxagekowetikekejopuz.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_off0000f013.bin
fb64c20d7bf2e9ae49aa0a24cdaa7b3330a155c2dffda894c52fac0754856e09
pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 17968 bytes
font_01_sfnt_off00011ea4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 16792 bytes
font_02_sfnt_off000136bb.bin
00fe3e10a12ba6b8bffe890560ddc9ec965d0a193e2cbea6f6cc05dd653dbffe
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 11012 bytes