Malicious PDF — malware analysis report

Static analysis result for SHA-256 e507db6cd1b7539a…

MALICIOUS

PDF

85.3 KB Created: 2021-08-15 03:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df478a9a37cab98ea2c491f7980c1da3 SHA-1: 6818f99d3e4e26398c4d8c8f517bbd36eeba38a5 SHA-256: e507db6cd1b7539a6d67b86dc2e30a9e8fc7ccb94ea1c8bc94266e4f6d9ece2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

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://wastran.ru/uplcv?utm_term=how+to+set+clock+on+onn+clock+radio PDF link annotation
    • http://harchovyk.com/userfiles/file/86549054364.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b16b5a44---94828645600.pdfIn PDF document text
    • https://olterus.info/contents//files/vevefijosutamobuximuvus.pdfIn PDF document text
    • http://ubest.ru/images/file/62454058070.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/93774156867.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/dopogewedunal.pdfIn PDF document text
    • http://naucseto.cz/storage/dezawisatawimowuzub.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa7efe8c09---kewufiwebewevonenoxaw.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/wowewanez.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e938a2c40c---23229648468.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f1542258---90714030232.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab20adace---72709803838.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa21497e212---bikezi.pdfIn PDF document text
    • http://freeski.hu/freeski/file/satibumeruvimebitumo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d955e4cf381---bedigeviwamutesutubariza.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/89718691868.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210620210732.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cdb938b0e7b5975b9a7499a707b82aea/56474965051.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/7291165437.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3fd43a4508e8a785f68e6978662082cf/66928697900.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607201f05c5bf---xeroxitip.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/39872423606.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/22690691977.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c34838392c---63768130073.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf79995c0---puvoragegar.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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 16828 bytes
SHA-256: 2f60faff7cf6dff5e7677df1ed5a66a8698c8afa6a46659954f7a20092dd01cf
font_01_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 10532 bytes
SHA-256: 1e9c9975c6738ef4f0fbc25297faf98682a19ef955ce15e57889fd6575220d55
font_02_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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