Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e31b179eb9b2e8a…

MALICIOUS

PDF

74.9 KB Created: 2021-07-06 06:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a9b4b058dfb198e66ad51b19045f61eb SHA-1: 1140099b55b7bf582171115fb57c9beed422fe17 SHA-256: 5e31b179eb9b2e8a48dae41e0dab4205880b624e1c09440175a7495b4c2e07b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mobile-translator.eu/app/webroot/media/files/jasuneponudidivitabopi.pdf In PDF document text
    • http://www.donboscovizag.org/images/files/mijipubobisupakitukutuw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f56f2666---jigaxiremagasuxik.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/28359942263.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f54787be3---5592320655.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/bejefek.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/jarefonolefakomexetir.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9c0748626dceecbcad78773ccb2189a7/9296431217.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/letufi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a864255fc63---topafug.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5a7c7598db79cb2941f55c509e18cf19/33024282441.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lasovo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccac3dda6f---87541901795.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/4637123712.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/79929435399.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/78387673632.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/936ddc6b509412dc676b2e69ad5ac9ce/35847981489.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094902345570---pumadosaxazifunof.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/movaxuzebaxiz.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c11601989---pugamutimutos.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2dc38948---91288488088.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/s61di5hkuhuhdplf44c2vbgfoo/sisamobonimufubijapa.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/57525908305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=isolated+ventricular+ectopicsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1ad66919e5ab7e8c84df38db52d6238c/92407871463.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_off0000c24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24C 10624 bytes
SHA-256: 744f1a6806087d67ced963b8967f0621b5bd8e8aa32270376a25b3a1c7369848
font_01_sfnt_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16832 bytes
SHA-256: 8b83c1be43572ffbf0e4572b24683d8250cf68f103bd9038a9c9da5e0c39ff9f