Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dfbe0addbaa98e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 00:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4c8c5e3fbe40f2408a2176628c9763d SHA-1: d0c480c854cf7c8d97f4455f9b7b3554bb98c8fd SHA-256: d6dfbe0addbaa98eae347a1216e86d4ad1be66fb8a42b6c81dcfe427f468dafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Pdf.Phishing.Trojan' detection. No scripts were extracted, but the presence of multiple external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=on+eagle%27s+wings+free+pdf PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37c258b78c---29325289044.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/96372169096.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f1ee15e8b01d7ee69616bb0a585b4a4e/kaxudufewigejumuwulurag.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076e17b600cf---natokoxilotunizijaxeka.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/46487886433.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nirada.pdfIn PDF document text
    • https://aedwea.com/upload/foto/putijo.pdfIn PDF document text
    • https://harom.ro/files/file/bogofitusijipiwubotet.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/janaxekedafemave.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/37590118272.pdfIn PDF document text
    • http://dejede.com/userfiles/file/2832845047.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1a9bda93c25df92607688591097b52ad/35703611845.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/dosadezew.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1fuap5fm5ejsl5ltgtdkks2p34/guwewimutemij.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zufima.pdfIn PDF document text
    • https://businesslife.com/content/file/relit.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pv4kjfnnsb6u7cfu3lpue5qddr/26376527409.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m2j7cdv4njp2pfnchr1ghgjpqe/goxed.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608066f6682b4---9871717008.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/tibirisudonemixutipeza.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/55c36c3598fdc8528d808668d93e78c2/kowimemodexifurufamejiwa.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b9db0136fc816a9d394e86a61a1dc366/wadatepiz.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4432cbab9b---95151974921.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ll42dpll5t85m35u96qvcuo9gc/44413802443.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_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 17948 bytes
SHA-256: 0df74c20ba49f1073ec4c358848ca0a549ff15dad2a0cd409ff1152f056370cc
font_01_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 10600 bytes
SHA-256: 1e0d8f5ca65e983985833c77e62cf2a214e4d71961941f5a42ffeda9c429ffdb

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