Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82c77a0eae39458…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 21:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 443e6d5444b29f760e9d01d8b2831762 SHA-1: f6366ae437d87f869b998e999247c58bfde929b6 SHA-256: f82c77a0eae394585d4e67a07deebf74d68fa160b08487456474e51632d7b87a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=cme+eurodollar+futures+pdf PDF link annotation
    • https://sasalidayanisma.org/uploads/file/vuzovovetugatometinufop.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778cfdd04e---misufegati.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503062425.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145810feb5---81184571678.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/317eae4d7ef0d8378cbafe51c6239d63/posefer.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/xokiveka.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a7ee862e67463f249830822db4dbecf5/24698866714.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/02021075f9aa9fd24cf2063ff8090ad2/gowufidigilinof.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/45610818763.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5dab8df7298df97e09e5289effe67915/40109596514.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/11514284807.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/62688703590.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/45148316917.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/95508726474.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maseberofeb.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/sitakurogor.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/93956153080.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/vekupewemaladekeborokares.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/jozevijuwozikoniwed.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/kulesejiderujej.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/gifijerazufadus.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/142b6632ed5d1dd4afc0de82a58e1395/73312927686.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_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 18620 bytes
SHA-256: a45f08c7add2adaba849ec26d15c375401168eef20d35ee049906cee5749a659
font_01_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 10592 bytes
SHA-256: 685a99f474b494ba6a7f7a57d370a09bfbb8c7ba7a3a9da86d8648a473044b39
font_02_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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