Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9276a5fa0011d4…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 01:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c258291f1c9dad9891f25801937b98f4 SHA-1: f5878569d36b6ffaffcfccf2a5a8c07fc41603a8 SHA-256: db9276a5fa0011d469c3505312b7e4eb1380c845ede9494006ab1501bc96ab57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure 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://wisserarm.nl/app/webroot/files/userfiles/files/66730022445.pdf In PDF document text
    • http://iccarrentals.com/files/file/78117711745.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d488753fa40054c32cba6c9322000df4/wusejipakotesaba.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vl3rk759g80el120h031nv0eo3/zesazowulikoriragegomi.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/59543560114.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/jopixuxebewel.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/vemolomuxumikovufume.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/70532787154.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/84777861496.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/fonisudoxutakebekovim.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/37bdb00e459d0503c94488c0cef04907/97650361635.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/36667870979.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bab50f03cf---rituzebanefagasid.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084efe6acfa9---50717278637.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/valepuxozuna.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/efeef90df4b631f08affa11df4e956f3/27900173232.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/rusukorezatofonod.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zukunitufuw.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/bedetafebamimexe.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/82149073344.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/19010629369.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/39i1u7c1939vpk1lci381ort27/jeralowasumuxinufedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tapping+watermelon+for+ripenessPDF 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 18232 bytes
SHA-256: 7d702a1b01789b47523d380f6cdba74b65d585034dbf4e2c8510f12b60a9737d
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10748 bytes
SHA-256: 4de9f6110ab23def5643fc2218947c80ecdbc059ebb1217bda9f48a9fb8d0151
font_02_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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