Malicious PDF — malware analysis report

Static analysis result for SHA-256 f962d06c89a73053…

MALICIOUS

PDF

153.7 KB Created: 2021-07-05 02:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ddc9ae1d033f74712431bf1664021ed9 SHA-1: 3910989067cdf992b003307ceb847793b04cf4c4 SHA-256: f962d06c89a73053efe7e750c1a3206f9836368e2e1051d332216fa7f993e5b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://nomylo.ru/uplcv?utm_term=if+the+magnitude+of+the+sum+of+two+vectors+is+greater+than+the+magnitude+of+either+vector+then PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080650265b04---dulubosasijebu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7083124e97---torolumulasefuga.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a51de1a333e---xapofizitofugidiko.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160948545722d9---zeritoz.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/bonufikap.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gowibarobamanekuxuvozim.pdfIn PDF document text
    • https://stopserv.ru/files/file/45012899321.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/vajebamomi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0949177ba---90722522505.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/lbh8pe704cf6ha4cul3qko1nck/jajuvixovibuwere.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/46873268819.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/28330397573.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f5ece851cb00c5b0d915ac9bf3284bab/milamebomizaloweri.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/wixobosav.pdfIn PDF document text
    • http://drironcat.com/images/file/99798111434.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/lmeu5mc76fasds5rs4jhvtjm0n/6902451679.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/af4caa2f7176c4a05e1e87ffd2d066ec/25799728701.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c8cc9260---37888673676.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/31704773114.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1itfdrctlplemhi5r4d85t0fl6/femajetofugiguwikasiruvu.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/72097785155.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c5ab345fc---pawawozaxozobi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b4db877f---guwokujavum.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/935e1d86524725e5757b9b98f1f27233/70027609422.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_off0001f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F815 11080 bytes
SHA-256: e98e48443be71df5c48c9c88a631b5b1c7ea605ee73c1f4fdb3330b64fee1636
font_01_sfnt_off0002119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2119F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000229b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229B1 17728 bytes
SHA-256: 4ffbf0c5d8b912c5726c2864ba8f96bb5101c6be4d8729a4573c90ddabe31fb6