Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2860b45e8bf267…

MALICIOUS

PDF

119.1 KB Created: 2021-08-22 05:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43cdc959902933ba94e37679e69ae68d SHA-1: 33fc546a9799bc90333ee92e81194e19b0594e0a SHA-256: ad2860b45e8bf267adbd14ff819b33f4748cc6bb89d9821481be24f6edc78387
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=zubeen+bihu+gaan+assamese+video+song PDF link annotation
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f56d076100---66751824978.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/98709917802.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/18787345798.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b67d24bf068dc2e148e661b5aa36fdb6/59402774368.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/risurimeka.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2a861872b1b8ee925a4b3691f42f032b/20192123592.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4jlca6hr1k2hts3s19ntptse8r/92519889452.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vf0l8b6c2ldpmeugq1u8oofq83/41736124656.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e93jp7ack9od48i1mkej2u6cq2/10032192943.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08594918df---zadumiz.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d860967c4a80dbcf2d8a037874ffe5d7/losaguzitelizebajemov.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557dca2e94---mevogodinoniniwexasijufe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a9e5f73e99a186419e04fc855db8d06e/pofubatel.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708462d3149.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///nejebutegero.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2f7639d88---tedesuwisowefo.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/dodonetukido.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/pizegurotidujotoreg.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6120455818---mukenitewezomerefuvuziwa.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/pefifugodefopodoz.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bec45f15d---41142832818.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/914751935c8a69ad3f7f8ed7b9077000/320187838.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_off00016fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCE 17688 bytes
SHA-256: 37548c532c489b51f8e07920a4ea808a0353cb1ccce86157ea4abecf2c134dbc
font_01_sfnt_off00019ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B604 10720 bytes
SHA-256: 65f07a304fdfe6adba6d8a9ad7507a1d9c5285a88ccf275a9e1f10c10eb378c4

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