Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f33d8f9204a0def…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 02:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7c3978e6e305bc6ad9ced2168ca045e SHA-1: 3477007288ec2d5659b73388e31e5442f836b865 SHA-256: 9f33d8f9204a0def660a681817b08419503f83d72c86a05142a315f3cc813027
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest potential for further exploitation or phishing. The document's structure and URL patterns align with common techniques for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bhige1ruakjfnjkftuhi5inb6u/71527935746.pdf In PDF document text
    • http://sxhk365.com/uploads/file///xubexevomipamulabiti.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/nusodokozonoladiru.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/gunaxezilotojone.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/folix.pdfIn PDF document text
    • https://preciseenergygroup.com/media/29578190444.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/450580de9e4e4172570791c8b400f4eb/losupudopawita.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/votaxikutatesasajubikefog.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/52833496253.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d82fd3973---22762954813.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/09af09be7797219fa52f40cf666f0832/zidezotapufabitive.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/duxilowajojekedika.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608513a082c91---gokodajifum.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/34385089616.pdfIn PDF document text
    • http://imi.vc/upload/files/fozuxejitimumabitotaz.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/32373050399.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/meboterusapiwa.pdfIn PDF document text
    • https://aspirans.com/files/file/35451225615.pdfIn PDF document text
    • https://clove7.com/userfiles/file/41854000375.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9b9b6e2705e6ccdb0ac4e38c306e285a/mogabifizogifopelesi.pdfIn PDF document text
    • http://rococosofa.com/files/files/12202290552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+you+rotate+a+pdfPDF 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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 17412 bytes
SHA-256: 9679cbb709138b4b573e2a8442fc58e8b84f218e9a1ce203ddeb844658d69183
font_02_sfnt_off00012f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0F 10600 bytes
SHA-256: 91e1b90da012e19fd7ad3c2e61871dc1109a181ad1604376b9dd188e94f09207

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