Malicious PDF — malware analysis report

Static analysis result for SHA-256 836966b77f00c29e…

MALICIOUS

PDF

175.4 KB Created: 2021-06-29 13:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 469c60ff7febb121a952e08ff71942c3 SHA-1: b669a110a280ace89ddb0407ff31d1c3d3485871 SHA-256: 836966b77f00c29ec1184599acf7146d1b9382b461a09cefe5bd40f4856594cf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9652

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://isleo.com/i_photos/file/9944606215.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c795e48a460---kapugabevoxikolepimaf.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/pitofidutemape.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/funogixunowibirow.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9245c2e3bc---sapewadopiwojalifixazune.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/53819686913.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c4fecdd7e73a112e68f98387d03fa0b6/20511492239.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/i0sc38aqmocfrsq9dhjrg9e4t2/34484478848.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/tamewizadokinudilopanazi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ed0d98bd---88248416747.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be810c6561---53595019277.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2ae5a6c849d830e39503bb6d280b0927/54845957676.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91274a1e6---11603141428.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/molupu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160803260cd79d---11723834208.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/maduwobigakixisodexula.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/wubatunopefamuko.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/21766047260.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gelipoxabuvemalejuduferu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/33112727770.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35def7fce3---perupefafexosobates.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/95496938344.pdfIn PDF document text
    • http://domplus.su/userfiles/files/pedezidexifejikizekujoku.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/02a2579463e8deccc14e336af73074ad/34623221770.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/46041388463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dogs+with+blue+spotted+tonguesPDF 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_off00023a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002524c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2524C 10736 bytes
SHA-256: d45af9782303fca9f8cb8cd9cff9396443a50a26204ff09d34361cca089d651b
font_02_sfnt_off00026a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A7C 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00027fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27FEE 17908 bytes
SHA-256: a7054549e8e67b08ccafa0f804f8459fa0ec2285f57d41931b1b884f3ab8484f