Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc6944d1b8a89ac…

MALICIOUS

PDF

109.2 KB Created: 2021-07-14 00:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6db7595153dcdad5068c5f1100483aa7 SHA-1: 206060cd6fc1a603cde11713270498f71dfbac13 SHA-256: 3cc6944d1b8a89ac7f7a74b9d979694107702d30f0e365c15f5cf526ac23fb15
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as hosting other PDF files. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=water+of+crystallization+of+copper+sulphate PDF link annotation
    • https://baxsporthorses.com/userfiles/file/duwesovaxogajakiji.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/babilexu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a978ddebe32---27068426544.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/todajevivemunajak.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/lexurifidudikekiliv.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/zalifuleradus.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b88f2a49717---95715481261.pdfIn PDF document text
    • http://amandamaitland.com/images/file/82077454614.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/38122733712.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d8def95f33eb5aa5779e128462fb20af/vikunuritajixev.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece8f1fb99---41235285615.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7f5aff3239996512ee3de4f34f8eeb36/1607732854.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/6615d67d58aec8688eae15c203401db6/91126420563.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/54620087667.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1cd48d26c---lovafimifa.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fce75a76915af890756a74676d82f85f/nomevuwigogiwoni.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/lejozikejo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7a3492b0f6d6afcd2d06e919e6970d6a/65915850717.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/mirijifamebefarufotapewo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52e28d10---38686661997.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee02864958---teveduwi.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/43452701384.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5eb45c69ae98ad1f66b7cd1a8b3b333c/770176528.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706668874fb---pukuratedife.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000148fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FB 10844 bytes
SHA-256: 3b258ba81d7666eee7086c3314b016d7e724c1790a3b887cb3401250f8b286f8
font_01_sfnt_off00016207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A19 17460 bytes
SHA-256: b128087ce7d0abdb758f2e70f4bdadb0b0ef36e555502daeba4b836c22d2fa4c

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