Malicious PDF — malware analysis report

Static analysis result for SHA-256 8211012132032910…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 04:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3731a78c8780fefa0e85decac078476a SHA-1: 5915d7887b1d2654683972193114fee50e0f95ca SHA-256: 821101213203291057b22dceac3eff9ebafce2fb331ed9957b3dfea7a7875e0c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The document body is heavily obfuscated and does not provide clear instructions, but the presence of these links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://zigzagontwerp.nl/sites/default/files/file/82410959960.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e69fc09777---81074328779.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/r3oqavj2knp27flng3eohklhlq/12318010093.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d626916c1---fogetexozulaxadutewib.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858a3b7baeb---gusolaxino.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fea31335fad817036263071d2e3aef9f/60911165971.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5c3b17d5---25079024067.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/gogurerok.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4174d5320f393bed6bda2f9be4a24ddc/70573762596.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/47547545101.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/nukigalijimuwajezopej.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xagapofunawepirawijo.pdfIn PDF document text
    • http://medi-sen.com/files/files/13646363501.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d93038ade4c32f27a01a8b4caa0ef427/41018842770.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160753898501dd---58189905688.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5dcfd489c---pesirativiv.pdfIn PDF document text
    • http://cloverdiamond.com/file/4686786081.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/60ac45f7adca9915db6c09b9640a10af/meduxajowenodagugej.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/ledopimamowowuvamed.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/3795580484.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/31632396634.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/57906582471.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///46700401644.pdfIn PDF document text
    • https://loctra.net/userfiles/file/29868757423.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/61606662504.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/29607069543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cosmic+religion+and+other+opinions+and+aphorismsPDF 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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 20292 bytes
SHA-256: 78a34a17e1fbd2bd91429e106b2d0786782c7a99ed47104f62b964a4176f6cde
font_02_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 10992 bytes
SHA-256: 31a5662e05901d0fe62d9c13842b45cd07d08c68079733a8142c3a90252f16a5

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