Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2f635a93cbd383…

MALICIOUS

PDF

90.8 KB Created: 2021-07-13 21:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 612202e68570b40b0c9cc6a50d41a0dc SHA-1: 7e8a59769493d1553d0ffa57fc0c5c9e7206d618 SHA-256: 4b2f635a93cbd3836e4d0dc85b98784bab37854180cf79486ddc455e6ca67fa4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab794d174---pewesizepekimetisamowim.pdf In PDF document text
    • http://huile-de-nigelle.info/userfiles/file/85655918357.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8c4276a1---jelovujopoteniretejitep.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fobinorakedenawofudiwo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/g3b9qpdctfft7jq0qtfu2ajkp0/totifivoviv.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/25e03a8ad6ccc2e1d4c62a9fded8d0bb/90200692356.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/52229244532.pdfIn PDF document text
    • http://short-story.ru/upload/file/sakasekekovozelodozimo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2058a600e8---58194439236.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6ea702faabe0631d8e13161838b44226/zidarebamezugamep.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ad9677bc2---82054998667.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/ribudefutegokoxodojogif.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/97523200201.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/pileteku.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/zajawajarevepad.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/nuzimeg.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/28393932350.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/medoxinazimi.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/jokivotod.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8a3e7c54724bdcaf167477e16bf01c2d/lodapexaxifiluse.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/7168791870.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/817764e058fc76bddf84e645ec873baa/26224123139.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ad96e09bb---paseseripodajoveje.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/gezuzuvegokawifaf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c65b9ab3798188a87f7a4f654dac4f02/94870875281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+are+set+backsPDF link annotation
    • 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_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 20280 bytes
SHA-256: 7bc775b78281d6fdb21d75bc1f56e0ac45338263be488c721221c143007d5796
font_02_sfnt_off00014731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14731 10192 bytes
SHA-256: 3fb0562c112bb098d8a82f06e9957ccf21eb88c8687e1bb2c52c59f5c90a502d