Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12af77c7d8c3fc2…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 02:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 595fced89c9a20e1abbf4a845a941a33 SHA-1: 7319a7029d29f567eba4a70d21894d0bf5d1a08b SHA-256: e12af77c7d8c3fc2fb5ce1ae7014d41a03f2fd300bdcbfe1bd9d7855a17c3d0a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://efckrakow.pl/userfiles/file/newojasewuv.pdf In PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/tirakuziwugadafepo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lafk3l7m8hrj44012k3312d4a2/53961862068.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/gowisudabowexazevemulup.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/xuwar.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d132a451c4---92379482885.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/jabalezesefisal.pdfIn PDF document text
    • https://mattress-leader.com/media/44663889632.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1629460909.pdfIn PDF document text
    • http://protok.pro/upload/files/bokijuluvowebimekuzebaje.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/gekugitibotemugifijos.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed800a8d4---51123612167.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/mariredivepugafalago.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/77372811799.pdfIn PDF document text
    • https://soechi.com/userfiles/file/papilaguwu.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/tilosunamerijalur.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e53932241---koxafagupopukolurexin.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/gegeloroze.pdfIn PDF document text
    • http://maksimetall.ru/files/lavizosiraborumikede.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/dd7af3303e1535e13b2b3de1b118e047/jimovupavokilamesegize.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/togawadofavotiviwena.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/nefobob.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4i3il2tss2i94hc6u19jql0g67/fodaredex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=too+much+autophagyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25B 17156 bytes
SHA-256: dcf6c59334624328c8e4047ddab8e0d3243de80395b209c116c2c7dde1293254
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10356 bytes
SHA-256: 38a140c1b796d0db789429e0a9dc8789f160cf7013509c6aae65af9700de99fa

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