Malicious PDF — malware analysis report

Static analysis result for SHA-256 330f6c30ef048f63…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 04:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdb140f77465ed34c60d8eb00a8a682c SHA-1: 6e3e550f07d249549c78c997910d14a825e464d0 SHA-256: 330f6c30ef048f632edcd331ed8c06d9fd11320a425d82d2259b6ae608672d57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=geology+of+petroleum+levorsen+pdf+free+download PDF link annotation
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2b5862cf5434d597b8a51dfb6b30a90d/39429616232.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/dabotaramuliwe.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/5144897831.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/34485759503.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad726500d69---bewufujavotub.pdfIn PDF document text
    • http://sooclose.eu/upload/File/90651633146.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/34085876845.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a14fccc0336---bevajojomukewitamexawa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2a228njqau4pt74vv6olfuvlp5/40401493018.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/a86bf7fcbd80751d502661c16d765e1c/zopalapenemojolifesubof.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/vomezujixejoko.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1824e528---wowab.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/315414555.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/2708156777.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/14377206917.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/todofukepazefizamijo.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/307ea00792ea7e92845174c9d28e4d93/17553500262.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/nigekonidalekogutiju.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cf2d075e20c2f76cabc2cbb6b30b420c/jidevinakodok.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc9177de28---10781987588.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/rozilibilasedumade.pdfIn PDF document text
    • http://mp-journal.com/media/file/rifiwidokibopanokepebinax.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/dutuj.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/jafifevesagupi.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e5ab36a1d0ce514752581a9f53b78549/pidorinotetiw.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_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 11156 bytes
SHA-256: 0b49e943272fef84541f15ef50056d598e16f10ff262a1906c4c74fe5229270b
font_01_sfnt_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 16760 bytes
SHA-256: 19e32e1fdaca74eef8daf67f1ba935e87dd6945e7ff65b4d0e1b248459327c9b

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