Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c7cc5fad7bb874…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 11:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3fe1dba026d5392064f537cf6b31ef96 SHA-1: 9b7c6ca7f2939dd9617fd25a2b1f206eb91fcfc2 SHA-256: 79c7cc5fad7bb8745cdab201e428f1a8ba1468f70af5e204e700e1c9021e8bde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://smidgel.ru/uplcv?utm_term=food+and+beverage+industry+australia PDF link annotation
    • http://stefani.cz/fck/file/dafegapefugogimikedi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7f2c1d43e36576ea176bdda04d0ad42f/25038878229.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/foluzukafuz.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/dajilelevigajilezek.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902170234.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/zabuzez.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/37560252776.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/bikubopisar.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb93812f8---gozosufisoterelutumuv.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301af25fcd4---pulowawasibanelijup.pdfIn PDF document text
    • http://headrepublic.pl/images/files/xazadisivozisofugu.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/74307532692.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/folokulusuxasedosokoz.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780f654bd3---16432739258.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e171b18db3---63747151297.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/pewunolip.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/gelugojavafewogawukipasod.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/70752207911.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejetoxigepimifiv.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5d6bd626---22221718196.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/xulobavewoker.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/18359988495.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_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 10820 bytes
SHA-256: ea35e2b64d02d443f455961f7daa28493a4b59c4f88bb495e38bd48c9f19337b
font_01_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 17740 bytes
SHA-256: 3d2b250d3d3fd717f88acce1aa0e2b853ec324e580247030f7d89025361f671c
font_02_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1