Malicious PDF — malware analysis report

Static analysis result for SHA-256 39267766bd24afac…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 00:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6edf56e18e8ab92b134ccd0ca02320f3 SHA-1: a1367c7c6363a0a240fee8e03e4fff30c41b30fc SHA-256: 39267766bd24afac577db5fa1e47805c6f87c7eb2801ae67b290f5c7460cb878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these are likely part of a link farm designed to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/76f00b0f4427b1b3996f3c00d76da3f4/duwijiwaxodesomiwesiwik.pdf In PDF document text
    • https://valenciamaids.com/userfiles/files/zitoritosujariziminibewow.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b7031aaf95c9c05d5ddfb7791e1bddbc/91814275262.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/pukavoti.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a513831d8d50d10ed9d3869c0a41b07a/8584699123.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/14698050685.pdfIn PDF document text
    • http://poorclarescork.ie/images/jajefad.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/muduruxo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856755af20---4665232328.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/xikedizabizogezi.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/patukanupugukup.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0933faa5---44111009367.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/jukekiwasujenitulujibo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e68b769c708---15950010293.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce6aee3fbd---wabepil.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/25543448920.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210704022205.pdfIn PDF document text
    • http://hncastlecable.com/d/files/92670745830.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/8012507443.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6576da0a85---97102124420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tia+portal+pdf+anzeigenPDF 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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 18816 bytes
SHA-256: 2a5f2d01933982bae30d72a3d39fbcd609932aeec127a744bf26ad25c91afbe9
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 10528 bytes
SHA-256: 01d33bc3616d317a739603fe5967702fc98473a61fb59452c817987eaf194649
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1