Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffc3603d2584695…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 10:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0247f89ba026912492d6c498bf10274 SHA-1: ea2b71c50c0dabb5ac0bc957a378283bcb8eb437 SHA-256: 8ffc3603d2584695411fa496603baf3d37228581929bfb0a5abca101a2afe801
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages. The presence of multiple external links and the nature of the hosting indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=molly+bloom%27s+soliloquy+pdf PDF link annotation
    • https://marwaautorepair.com/nbloom/fckuploads/file/fozixifopokexubimixep.pdfIn PDF document text
    • https://diphong.com/uploads/todibivemumilimuvoz.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/84697750217.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/48209808117.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e194f332fee27938db08ef1874c10512/47188996674.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/legunaxemolelorefogulit.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/rubefipiriguwavu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/269ceb079774739d9899ee2142ac960d/befagimo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e64267bb9---pefagivolil.pdfIn PDF document text
    • http://orem.mn/uploads/files/21206036737.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfa65e4c2---gidapik.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///90399541797.pdfIn PDF document text
    • http://soupworld.de/upload/file/56897460249.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c74696dfa---96085403859.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da28f202c---tizepevatal.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/9584281999.pdfIn PDF document text
    • http://giga.sk/storage/file/mibefobigojitotesanuma.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/79130076393.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/41110792941.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1ef3pk1119q3t6u3eflqm21651/mopib.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/36231490121.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/79097307052.pdfIn PDF document text
    • https://onlinendttraining.net/files/58395158947.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_off0000b99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99C 10592 bytes
SHA-256: 9b4742321f329e6ede106d590d11875c478e534c30abc53093eba5fa3382293b
font_01_sfnt_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 15000 bytes
SHA-256: 5cd92ec3eb158c754df15e78d5fe17b91c7dc679e3be13c6b8faaa39282c8430
font_02_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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