Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc46e126b503357…

MALICIOUS

PDF

86.2 KB Created: 2021-07-31 09:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 40fec92f4d408302c5810f085961bfdb SHA-1: f7cddb277f63e66d47794c8cbd4119be038217be SHA-256: cfc46e126b503357e555700eec20a676f6ec421ff82ff5d8ce60f2c46d3eaff7
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The presence of a 'download button' lure and the 'password-protected archive' heuristic indicate an attempt to trick the user into downloading a malicious payload, likely disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=lehninger+principios+de+bioquimica+6+edicion+pdf+descargar PDF link annotation
    • http://www.hermosabeachbungalows.com/userfiles/files/papidiko.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/feb2a0c8e9d135e4c3e70e6a1f43dfbe/xovefimajimepanuxad.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0587480d63---54412165551.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fqc6gv6p458adlri6hcimmpirg/buzumunatajasalupitul.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/koxitinirod.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/munokofutezugegitubokow.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c060a3b307dc2560ece63cdfc05ef188/19891672377.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/kojisupuzojanuzefunuxujo.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/jejojogazajasomuzab.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/94033905068.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7713585e7265e924ed6a99817d10dbed/54962143936.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/27971889339.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e354da99a5---80408766644.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27946ebb5d---wabisef.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/24330687359.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608196065837e---pomotag.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c485e87a392---19836450185.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/holne07br8m9mqqnolcahbtiq7/76532604634.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a481f6b4---28194251825.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/mojanolavawefudegosadom.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/wikexojoda.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/jonerufizeruzelefafamepib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24680f076d---92850780729.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hmjueoi1peh3rhj8lervpi01b8/wobanilelefujubul.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c11b82a2---60337480808.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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 19616 bytes
SHA-256: 070e9f2a822a21367a25a7c4a79580611304677b65dba61c55b303603a16096b
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 11432 bytes
SHA-256: e6429f1f618522c4e7c095813e7190afac5ae02e9273865f7bc725df77f87b33

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