Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b79d1e7c9a12d8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-15 22:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cbee4c935545e03e48fa836198ebfb2 SHA-1: e172f0fc4bde639bbef7c16a7aba3aaf2c6402cd SHA-256: d6b79d1e7c9a12d807a3f28e3818720b37086ea9604e8667f7f4318fe34851c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, one URL points to a compromised WordPress upload directory, suggesting a potential distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://elfuklid.cz/foto/Image/file/wojudilimuxozudaj.pdf In PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/60207611714.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/12224843505.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/34773283560.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/boxixigabo.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/3801551515.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/wabumaxixejuriv.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310dc45e001---sumitig.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/toxiwofaluzud.pdfIn PDF document text
    • https://csn-alliance.com/data/files/90210175885.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/10439142701.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109080247058293.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca67aa70b---94013107066.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2ce85255---xibedolejifu.pdfIn PDF document text
    • http://njxinbell.com/upload/files/62610814560.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/tolevapuruwogisije.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/86630790624.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/62938063612.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/93384813965.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/lanukakowe.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fb15070c1f4a5889bc404e1b4c51105e/pesifabexoxonuneg.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/melenasowejalobotene.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/69190307608.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/18251222443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=photo+lab+me+apkPDF 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_off0000bb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB14 15412 bytes
SHA-256: 2541b856919cb3357fc86dd2404c327509e723ad4f53f279fbff6d6a5d61d2fa
font_01_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 10284 bytes
SHA-256: bdd8b3e0adab6d8bebba0eb5b13628d0013ba37b9a4f3d71284c9f51cda3f5fc

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