Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f1d6f92ef36262…

MALICIOUS

PDF

93.0 KB Created: 2021-07-13 20:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1171c05a4d7cad455d7bdda168c3f5af SHA-1: 37d05a2ac0a865bbb40904440971798896905d5d SHA-256: 41f1d6f92ef3626244b13eff758e5d7270a8001f8fba2fc43f8c503d31b5cf2b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=to+be+cynical PDF link annotation
    • http://adance0112.com/upfile/editor/file/kazeruwagapekujukefu.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/weporuxofolofot.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a9dc10321635a1f7356cff826d68a01d/zupojiwojidewabobixijuz.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/1054588523.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091492340bf4---73542116853.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/76967482019.pdfIn PDF document text
    • http://momsystem.ru/public/file/9530381960.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/83561132206.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704994e5fc8---nawiwawozafavuwagupu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc66e7914a---tolomikizeninumuw.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ec203aea0fa56e7742dc4604959936ee/238250743.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d06a0f600ca---xumaxitikeluzemodoz.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/welowuwas.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d17563649---salobewivikafinabozof.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/da32be743c4e2067bf298aa1764dbe29/55108944210.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/kibijiwozefawovowizeku.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/31347742030.pdfIn PDF document text
    • http://expresskaliski.info/file/sawilazu.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c61873a7d2a---wuxotabuziwijawad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94c6ce92d4---80367088134.pdfIn PDF document text
    • http://ipublicity.cz/data/file/wowedurikuduwoje.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/caba85102812ee14589cca88735f2924/zubavazivifitit.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_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 22072 bytes
SHA-256: 3c1fc800e589ee7a61b12c19e3f71722ac77d651461153b3191b056c4ab8e62c
font_01_sfnt_off000136cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CB 10076 bytes
SHA-256: b17ddb6e4725692870508bfe2bdf1f92125ea18c5f32ba5a3cca03dfd9eebe35
font_02_sfnt_off00014d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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