Malicious PDF — malware analysis report

Static analysis result for SHA-256 006c439a5ef93151…

MALICIOUS

PDF

79.0 KB Created: 2021-08-30 09:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2535462ab70699f8793a6897feba8336 SHA-1: af80de736b511e10fe613bccde3582b003f00856 SHA-256: 006c439a5ef93151d2db20e6279701783c3edde20f0f768642b3d103ada4c25f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of the document as a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://garglob.ru/uplcv?utm_term=how+to+write+a+cosine+function+from+a+graph PDF link annotation
    • https://etimes.mn/uploads/files/fulijuwibe.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/vemusarubarulojedigu.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/tinuru.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/bbe5ca1d1d99e64da53385aabb9df0eb/dopizorigatuwo.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vf5qbt6vo8r2s5qah03cejrin6/62040819395.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vovarojixefowore.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/nazolonuxixunefa.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/66696221664.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/867522642.pdfIn PDF document text
    • http://orthodoxnews.us/file/jutuxepovepatolu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f48b3191c218df017fbb80b938d3a5e/dixusarelogusivatidamo.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0dbb57ed---39617606423.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/tafiwaj.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc585653e0---vigadotekepemoguba.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/xomodozodatebububupirupoj.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/42330240443.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096918a4ba25---70521856169.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d83ef501---35098109104.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086baddbc69d---vuvavopunolowe.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210725_FEFA25CC75B69DF9.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e00ac2344fc343f84855fb90d6edff28/92344871483.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_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 18032 bytes
SHA-256: d107f0efbb60e0469d3b053348f77487351045b067b5c8671e56d970d22e6641
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 11056 bytes
SHA-256: 2d1073812ffb7c1c8157c80bd6182706bf873106c7eea777680fefb86c2967d7
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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