Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa936192f14fbb0…

MALICIOUS

PDF

89.4 KB Created: 2021-07-27 19:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99b6cafe3ca4cc8941f13ceb75147289 SHA-1: de8f3138513bf610f3039a63f03a8b9a3a0f6c01 SHA-256: afa936192f14fbb0f2af954889c9b6b544f93da009a14e02e285484d7d40414b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://eviljoy.com/UserFiles/File/sikipodejuwumurunefazip.pdf In PDF document text
    • https://signika.pl/Upload/file/62795528714.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/58370167845.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0228a88803---83346868360.pdfIn PDF document text
    • http://stevis.cz/files/file/2607217069.pdfIn PDF document text
    • http://darec.sk/files/files/30644495065.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/wezijunepab.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8feba44b89bb607ecb311254daba8b4a/56411106304.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609485477f54a---mumegodaninenijojitub.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb3ed984b7---96702067605.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/komugaw.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/tazivamaf.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/13632365629.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b20fb3d2a---33563860801.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826efc879a4---89865555396.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/67641373576.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/45812107999.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/wewinosisajuvenalubizow.pdfIn PDF document text
    • http://fournitures-reliure.com/prod_files/16722087527.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/28398712098.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/13370100634.pdfIn PDF document text
    • https://ikima.fr/uploads/file/gatabatuwebem.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/q1t3r0ad3ipo7aif7qlrdfn7u7/vanefenarazu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8496a907e0---60189050451.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/18073516817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=heine+borel+theorem+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 18764 bytes
SHA-256: 520d3089f6a815051ea9aa679dd4309fc985aaaaa41c0092869cbea2bfc64835
font_01_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 16088 bytes
SHA-256: 9097553d388de6ba0c4695ab3f5748207509627cf951ebf2c052ca71e31497d2
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA5 10564 bytes
SHA-256: 020970184392b1a8ce203571c1217adc3c277f27462eaf0e499042697db238fa

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