Malicious PDF — malware analysis report

Static analysis result for SHA-256 0643a90ee21eb461…

MALICIOUS

PDF

97.2 KB Created: 2021-09-04 02:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29c2321b27fa4bcb0f0e1f42833f40d9 SHA-1: 6f3652b43fb7b72d03f72506353154dbf3eba151 SHA-256: 0643a90ee21eb461a9e21cda9cac779d1dfe78fdcb3f3c2847301e86f2d9233c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting, indicating an attempt to redirect users to malicious content. The document's structure and embedded links suggest it is part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://verduciautodemolizioni.it/userfiles/file/vofebiga.pdf In PDF document text
    • https://zionapostolicministries.org/uploads/file/tixudek.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9a81cd6255cabc4e3c6f778ffecdb929/guvifologunasof.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/wuwazibovopi.pdfIn PDF document text
    • https://tekartltd.com/upload/files/61203947108.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/38234757189.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210731200622.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/16080323702.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/86062951817.pdfIn PDF document text
    • https://flomogroup.com/upload/files/korezabavibifefodira.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/63717330259.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/lidanexojududosiw.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077501521cf9---navipilasatelumikuzi.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///69233268052.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/60680630950.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/sotugibixenimojavomig.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e1435fbb---9198354382.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdb6ca5dc---fidovaporodenalowij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kanji+characters+list+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 27160 bytes
SHA-256: ad873b1b80349b075151705b02dd393abacc760e832e9896839f0dbbd42382f2
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16784 bytes
SHA-256: 3dcb29be274bbe4d27da5e987f098ee4451760335664fee17099e7d15b1cf022
font_03_sfnt_off0001459a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB1 10716 bytes
SHA-256: f288d552f45140cc05c2f3682d6349bdffcf8d1bcf9d57378e36544ce53a71d1

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