Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2bf871b8387d15…

MALICIOUS

PDF

91.9 KB Created: 2021-07-04 19:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 67114102c89b6c0444c200b061759549 SHA-1: 44fd00c1169d02268d8364a3841aeb7d598d4e3b SHA-256: 6c2bf871b8387d157d06d96cca25f943c4ea4eab979bf791ff50fcb3a2ba83b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted, but the structure and URL patterns are strongly indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=which+class+in+spanish PDF link annotation
    • https://djennebeads.com/nbloom/fckuploads/file/61115939394.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/bk399ipd2ut5ja2o4n0tjsn6e4/valamuga.pdfIn PDF document text
    • http://mospolytech.ru/storage//files/revotozuruvazomunipalitu.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6b303183ee79b291b1820fbf0016f14b/94758202415.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd40f583465---22209653317.pdfIn PDF document text
    • https://educhina.mn/editor/files/wibik.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kosisizifeve.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9m0v5rt33dmlmsoc4eed08667q/44931146873.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/42771393764.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3af4e29e---muvusepoxupiz.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/85375758800.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2870dbe5---19881646532.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/kazolotewotur.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6b989331e40810ef2094bdd3555a1cc5/ruforawo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/50301232030.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738952c9dd---36686804777.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f6402ad4f3ff63179d97d3fde4cc470a/58149967580.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094396b48e13---zateniloxoranoko.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a756eb04493---5067492862.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/fe5dfe4f42ab473216280ac93b78fa7a/99355580780.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/45699689489.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/24f9eb3effbcf8ab50a4a6931eea6f41/febulapemaxoxub.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/12407024662.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_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 10012 bytes
SHA-256: 53623e6336c24c43d277b77f3a28a4faac19999f8b1181baa19b57fc81b25424
font_02_sfnt_off000133ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EF 18388 bytes
SHA-256: d50ca64623afba6a5aa1cad201f43c64a6b0bfed81766209f0f5241572a0560c

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