Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d1743fa39d4b6a…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 03:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef6246039b7e9ddcce102f09362c215f SHA-1: a74adbf5f5271316893b0c202029ddd1f7097078 SHA-256: 41d1743fa39d4b6a9a6c658173fe4b471cff0ecff36f09fa5be88020d794a5cd
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, with several URLs pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://wastran.ru/uplcv?utm_term=ethics+toppers+notes+pdf PDF link annotation
    • http://eg-connect.com/uploads/editorfiles/file///90853154674.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/75338465761.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096386294828---guxigeziluxutilowaxob.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a017a67101b---62717352140.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/49970205897.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/55477e3c8a431566f81d1bb298e3564e/55603122932.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f3d11f558b9a09fe2e4e9cedd45d5a5b/45182984923.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb96ba3250---bekef.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/978fbc41e78accc3be194bc780484f2b/xufovedesa.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/52009243805.pdfIn PDF document text
    • https://m3csrl.com/file/46180525969.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff281dcfb---savuzuwiforobizekajos.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a00496cc090---49411818522.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/59443155206.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/28177327156.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kapaborezonegapitile.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0709e913f74d8858124f89472ec62036/65210983496.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/nofakepamumuvujam.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2952601021---dujoriperigibukozi.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xurofozelafumogubuke.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d2634bcf71093572702090bf87ab41ff/lirotenixezogepokax.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/42244135117.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a06632a306402b6dcb9491a44fec3c0/80288628069.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/28689087537.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a9175997---37288908380.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60d4a0ce5b---20709531539.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9tce25h9dj9rj0scag7nfqiapv/26227879636.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vmlcoka47h12aa2d2c8igj0leo/41024846540.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_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 10492 bytes
SHA-256: 8928941df7b75f499a691e1631295f65622994f449bc6ed9f2342ee7f8cba1fe
font_01_sfnt_off00012bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 17880 bytes
SHA-256: 16ba36ee3f07ba954e2c3b9586187a304848e8f9f6ecce2780680376e162c0a8
font_02_sfnt_off000159d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.