Malicious PDF — malware analysis report

Static analysis result for SHA-256 837ce7c49b49fa33…

MALICIOUS

PDF

82.0 KB Created: 2021-08-31 07:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3f8e27fe351b54661d82c40b7e39366 SHA-1: 3a52e50190ccd4cece00a53ef84d74fc799a65d7 SHA-256: 837ce7c49b49fa33eb24311714db294056a9e9e5c6c95b69c4786922c5ff1c07
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into clicking malicious links. No scripts were extracted, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=three+main+events+in+chapter+10+of+the+outsiders PDF link annotation
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19c5bcaa4e22f70201b707f853f26bc1/sebolizovijewi.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zexavodojote.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/47776615217.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/zinepubikive.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kadugeligifekotakakazuxa.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e94971f157e75e622c755d6fa1bb3581/kozegorev.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/sowazosupowoxumisaxeb.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/53359610429.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/salnved2ca0qvnkcebts4qt6kk/39493688965.pdfIn PDF document text
    • http://aromata.ru/upload/files/38918970373.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qfvsf34bu4nb9kcqa2jn1aokj0/fofovobiwepowepal.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac9078823---xuwuna.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa666c58ec3---rosajazenizob.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dfd162c25---tuvod.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607073ba42e51---87867585931.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609631ac9416e---44599219947.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/zanobijututitufewuj.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3603a5894a61c98f21f8988a5860046d/gurubigikumirala.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/5837989650.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/44245055665.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/cef9b13f1965ef80fc871d7d5f3f93b0/80889161550.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/mipibaxax.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60dfed7b7b---50780551031.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 11140 bytes
SHA-256: 90596e391e46d2e6201417949d08cbec9caf9a6b6d7322eb7db9e01819665f0a
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 17472 bytes
SHA-256: 8cf4ea270a57f46940334e85951aed3d264c9f0c1a4ec25d5f0ddf76d2a04eed
font_02_sfnt_off000121bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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