Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f302be7d7db93a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 04:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32820e6f23ae36e1f9cc307e3d86cf76 SHA-1: 3453baf44083b5bf651838a6743868bf3195906e SHA-256: 44f302be7d7db93a67ce87844acb50833a3f3ee116da8c0db5ca996237380036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7916

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://synodradomski.pl/userfiles/file/fafetasogimok.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sagesix.pdf
    • http://broadmoor77.com/clients/39738/File/69790529658.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/lufinobedoxujog.pdf
    • http://ehs1958.org/clients/73155/File/17651223799.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/e43plf9ppdf0t8rbmcemkatgg5/20783061657.pdf
    • http://monterroso-construpuntos.com/campannas/file/vidowakibexojitodotexonub.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/kopapaxatoludanoluxowob.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40a9dab5de---gurumagusakitapalojij.pdf
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/xudulisomigilatevaliwo.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3284abbe---jekawanumekalutozurexu.pdf
    • http://poltinka.ru/userfiles/file/kegumu.pdf
    • https://psfund.org/public/uploads/files/cms_files/70615857063.pdf
    • http://utpcomp.ru/uploads/files/batigufakoxamo.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c911dece83---rejusawu.pdf
    • http://movesearchesuk.com/userfiles/file/sitekotojonejikizonem.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2da606f01dc205682c319181ffaa7cb1/gezedexilon.pdf
    • http://novichiha.ru/pic/file/88267410217.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2919749194---depezuwomo.pdf
    • https://irantruck.ir/data/file/wubetedelilane.pdf
    • http://mlsy.cz/images/file/files/pisosebujuzewonoz.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd54bbf1ab---67066645371.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/57751d5972a94ae563a13e9784e9cef8/99742457470.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0c8427591b8b050ae2b4f03236ab63a6/37657131972.pdf
    • https://detmers-kontejner.hr/files/17938358520.pdf
    • https://arab-hams.com/Ups/files/81690368614.pdf
    • http://ownlines.com/upfiles/file/92441695671.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c1031549a8d1819648d00fa464304aa9/wedubuveviro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=newton%27s+first+law+is+also+called+the+law+of
    • 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_off0000e381.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 16792 bytes
font_01_sfnt_off0000fb93.bin
fb7d296ea8894b4e715407d365289decf2ee20a92c3b170cdd7cdea8e84d6b69
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 16892 bytes
font_02_sfnt_off000126e3.bin
90c301bf279a1ab48e062f3c38a59ac9bb2c246858d17a0181b250a8a0ecc757
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 10672 bytes