Malicious PDF — malware analysis report

Static analysis result for SHA-256 793a092457bbd766…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 19:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 651b00444f9ef8e58b1265193cacd506 SHA-1: 1cf7efc370ff28792336233ed350b5d841347723 SHA-256: 793a092457bbd766c81371c09e74a34a05d5a9a2202d2b6ae8b9497de3c9b598
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to other potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked PDFs. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://laborke.ru/uplcv?utm_term=klasifikasi+ikan+lele+dumbo+pdf PDF link annotation
    • https://anitacalderon.com/ckfinder/userfiles/files/93272529011.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93b3a048a---92178148506.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/33892607843.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/5976246287.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/diweri.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/bigezudefofej.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/63288314311.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ejj806a7v2rgr69g15d0bb987s/60852043620.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210831130658.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/36417099639.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9b983371---75634624775.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/geferukemaxe.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/879hliglnl4b57cr648k2npgds/gunuwoximowovot.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d07bae535a9b6c97732dc969f2120201/nimopatobuvedezewaxes.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/f9j3re0641av07s7r51qok6p15/bosefusotupi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d97a5be66---80532427668.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dfbeeb45016a214a64b4260ecc9b33c5/14655006746.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cdc3a8a4---fufedibupatufepidesuse.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/50473737803.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/91974539412.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/375bf7590b7e43c662a771618e34f3b5/43298680650.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ed9a1622---lavetomugamigas.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/78a44cb413203c456177b10661cd8a93/jekena.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b1a7d770---46522995244.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 17964 bytes
SHA-256: 327c8291c8292b227ec4d5fe606775ad1921a553f1fd6e906b52632ced6891d4
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 17620 bytes
SHA-256: 94b7bca058aa374f54fd96027c4677edd3d558e7e9bf86ce49a77c991457052e
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000136ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AD 10784 bytes
SHA-256: 51843d99408290f83743b262888c754e28d2ccfefeaacfd1caf6548361bf919f

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