Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e92fc6ec8026d9…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 05:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 791e87eb85a4ecbe44e2dc910d018bed SHA-1: be23339f7f6122804b9b8e1c150b4f28b408f276 SHA-256: 63e92fc6ec8026d9492131f051d139fb035f48646d6f64852ecee2f7c2cb7d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to numerous domains, many of which appear to be compromised WordPress installations. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=the+prophecy+of+7+percy+jackson PDF link annotation
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6b6e05f14cfc72c9c0f53606ecbb617e/21827365348.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709de0cca18---rusomuvawufifavotiwixitaj.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140fb6643d---tiruk.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e36137089---37112158569.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b278fde4071---rimowabigida.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c69c2655---58155311867.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070571f3c11e---vabepixojuxitizukifimusu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/06d1774d783f30b527ec1b51859b68a6/kopevepamomowopejekinatow.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6031c3274e7c92ec79b6febf7e0d6c96/50397383658.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/6615228337.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc1a3b9c6---nuxususiwamupirami.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b1ca81bc---tuwarage.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/44047565150.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/91729999014.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/merudagovaxuluvalele.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96424b6c4f---72008640135.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8afd1c234---zuwigavizuxaxe.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/vewabelodinamo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/c4pds2ft0la7pr5rn2agk8350h/buwetitaguvusa.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/23f82e6e5e4736822d8bae9f46df2663/65056939676.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f933eb7570---mesizaloragiketise.pdfIn PDF document text
    • https://pellevah.com/upload/files/turomegomisajarijaru.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/tevabudisigap.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_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 17164 bytes
SHA-256: ec37a4446c431614f3c7d5c23b34b1bd3ff25486ab5d15b5637c31119253d6ed
font_01_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 10688 bytes
SHA-256: ecd6fdec144ee7588236e594d09ccf04dd5787c9f7b04b6984909680246ff37f
font_02_sfnt_off00013fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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