Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc4b7231a63cb06…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 06:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9da1ee18973e04d33e35de4bf41ab7fb SHA-1: fc1263ebbec580f70309c71b0e22c8eaa3de5b88 SHA-256: afc4b7231a63cb0667ae2425d97c2f177647f8191433d783b6cf167b6e241f80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=osric+rpg+pdf PDF link annotation
    • http://gdwtechnology.com/fckeditor/file/14923127863.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/320cb32d43f6a3202672b6ec36f6e918/51528501460.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/bojitipoxifo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607305b982d5c---89906652336.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vutikezewagofepevub.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/9c11522cf22a09aac66a8f165185b5d1/nufujagazaridunatak.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed6b8a4fc---dugopuxuwekubituzalub.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/35518315980.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/rufuvewegulosinanuwuwef.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m2muaec5k8ih532m8ktmie8si0/19677375553.pdfIn PDF document text
    • https://slide-bearing.com/d/files/purixutisifuxanojemenuz.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/17999957142.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/65735800504.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/94722171557.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/40723679269.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/59502434662.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f66f1bd80b3---vufanimilizegawubosebat.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6u9qnu64gr70gjmr57kth2n1j2/wanijaver.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pvhpo14rthvvom78fgug7b5bvq/larotowilezujuvibefikaba.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/lozakasalagawivak.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/89261419895.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/nd7qhgubqkqefi3fijdk2l1r0k/79473900908.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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 10156 bytes
SHA-256: ba964f416285f517ed0856668a0c08307cf74d8d065006af26be389ce5313f96
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 17884 bytes
SHA-256: b55fb1f1dc222fee2b22cb3b8cf5c1ea5199c538504e11fdac4fb72fd265d9a2