Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a1a736c07905b0…

MALICIOUS

PDF

124.3 KB Created: 2021-08-07 19:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: cbe6dd64fc7ff66e5c82dab3af8e62fa SHA-1: b08a67a2ded38daae441f4792bed490464019bd8 SHA-256: c6a1a736c07905b0c370706bdfdb939b763de29d43c6bc4fd7c7bff8a585d2b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The primary goal appears to be directing users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://allytemp.ru/uplcv?utm_term=chessmaster+grandmaster+edition+download+reddit PDF link annotation
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b4c18991279a0f9ea9847a56cdc522f3/dosifamokutigigalaveba.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d26674302---nazarududipolaf.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/jg3a14jlptrkh32gds0qr275l4/70740903137.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6db26d7af670546f62465b8da359f9d4/fevoziwe.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a700136b---guxilixigevotugilotaxunu.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/91930198218.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/6r4o57nmpp2hq31d34o6celd2b/zipebovunoxilikodob.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/41063d3883157fa6fa1dd89086a5b212/gaduxogepe.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/62498302585.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/64057272820.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/vabegekinipib.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f8c52833a8d4529d1612c0497be29eb8/3419663424.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f2298d5a546---likefapuwuzomilagelasali.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca4742197d9fc24a908307007e898ee2/gevovixunefoda.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbff96bf06d10f11c253e444686ebd8f/30145830060.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b259c483340---tidakekitojebazagode.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/83955583182.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/43980192211.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/onmr4vteif69cktkfk2nti8al0/32297241625.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/zupavuzewarisanaloz.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e604b5f0---60791473718.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6E 2088 bytes
SHA-256: 275866c4e40fa169c377bc27b0cdcf3bb1a5ac0515b4fbba355958147cba6cc1
font_01_sfnt_off000166d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D6 10812 bytes
SHA-256: 7f092aa182d6b33ba5b1648f9c029ed873a776b248bcf154b11f8f55c83152c7
font_02_sfnt_off00017f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19784 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_04_sfnt_off0001acf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACF1 19664 bytes
SHA-256: 68ed7bf3452a0511ddc010171703d330d4296dc5a98b4a0969eb1c7f8d3e43e1

Open this report in the interactive analyzer, or submit your own file for analysis.