Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e12b99be592452…

MALICIOUS

PDF

104.0 KB Created: 2021-08-20 16:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f972fa0ab9dfbc696589f8e2c0bdeed SHA-1: 9d9b6dcd7d30d28ed0d259933d818941bf8265c7 SHA-256: 37e12b99be592452f090f74663fd65d319a26097efbdfabf9b9b614ac99ef02d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9532

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://aucoindeshalles.fr/menu/file/76862649851.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ad011c97c---68700986659.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c9392ecef---24225425961.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701523ea2ef---20300879265.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665fe4ff4b---16892930609.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755240c4173---2505359896.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1labn6c2ct0cllq6nokrdi2dcc/10144484858.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b1aa46f47ec5be972aab79cd6421cb8e/nasobejuvulirixopupaki.pdfIn PDF document text
    • http://splogservice.ru/content/file/32981271161.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/98667445496.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wajojelal.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/faforejoguwadebabipi.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108181622536870.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210529004747_228r7r.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090394335589---86520770682.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160df9f3432f80---45762152360.pdfIn PDF document text
    • http://vtaky.sk/media/file/xajovowojuwefaxirufo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f7b01c280---mugisusikomolisatol.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/83868373968.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/5383482901.pdfIn PDF document text
    • http://aimic.com/userfiles/file/80613548672.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/43168994216.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c30a5b43c444dccb1c89a052512b122/zovetuxanopadiwe.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b0fa294e109c900e72e35a54d90017fa/zebivujabufozik.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/428891b364a734802ccf3d0c91f27c99/juwubaraxig.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dljtn8o78u7rkrimbo09tgmemj/dogovupekabefutomalekatoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dios+te+salve+maria+llena+eres+de+gracia+letra+cancionPDF 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_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 10780 bytes
SHA-256: 2fe97f88a94c088521b7a59cd8f6849b4c2a90c3e049011e00572d1ef4d3e3dc
font_02_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 16944 bytes
SHA-256: ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33
font_03_sfnt_off00015147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15147 26348 bytes
SHA-256: 217b35e1f9eabe34d9afd0f107b564de1e97140efd96189b94907af4ea5c391e

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