Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59e7d0bb7d66012…

MALICIOUS

PDF

101.9 KB Created: 2021-10-09 06:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 615454821d2dad60a84e38476cb464c3 SHA-1: a680b4f42297c6566fd00fe029380c9501bb6c32 SHA-256: d59e7d0bb7d6601205b2f2ab2396c0ec353ba450864159e1e72b29116e767a7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://archism.ru/uplcv?utm_term=waltz+of+the+little+dog PDF link annotation
    • http://creative-format.com/upload/editor/files/68354472855.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20211003025338.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/vobalizavupi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/mudorase.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-19/20210919060703445030.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/ribogurametotetizapex.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/81188154927.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1232a4d91c04977586975d5467b571b0/89962364828.pdfIn PDF document text
    • http://chinalabware.es/d/files/85296850237.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109200345056541.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/gukiwimodetawulugi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4c315e0e---48074062411.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/51918073364.pdfIn PDF document text
    • http://ge-mak.com/files/78242371528.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/86596330922.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/7288316514.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/tovujawudepokuvifogisod.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146335f93521---67989619965.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/16524309342.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/34471778441.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/tiridimopuvasa.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479afb2d486---67321342480.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/desusajoge.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/josuturuxasu.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210912_235814.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec764cfcbe---gilevuwumemame.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_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 10316 bytes
SHA-256: 3595c4e165800a6548f4db5c0488746b9b4182028e3efd7c8e635c18d717e4f9
font_01_sfnt_off00013919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 21996 bytes
SHA-256: 3d12d663bbda720cc04825824a3a3c983d0544fb71319618fa8cbfa20356cbbb
font_02_sfnt_off00017205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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