Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6566a6e615b923…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 06:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41c592c3d16098039c5d2560b311bf53 SHA-1: 7c69fe0991cb37094deed01dda99eb145ed8f303 SHA-256: 7f6566a6e615b923a384325f23aaa830eefaa76f799b9ecaabd04ae177bfcb07
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=yu+gi+oh+forbidden+memories+manual PDF link annotation
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fdhid0vtqrqpjdal1c8poadll6/magijibonoparipox.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/romuxutarika.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/127c063b074b62c5283db7387a0c493f/tetumosopo.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210904_042043.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/lgcdnpll1bnn18uijecjalgjki/nedusi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7c1363f9---96362660617.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zajelonetojupivisuw.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/javugawatasejixaped.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/riguxujevijuvukibasuf.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/nezesojuzoruvu.pdfIn PDF document text
    • https://yifff.se/userfiles/file/30385276244.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/gebojajixotarapo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16113b1c7267c9---10019446920.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/walivusi.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93617612787.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/33747758211.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/baxatetideginudi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c7d6e426---61985298991.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/vubanipore.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fejusezeganarisixakab.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_off0000dfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 10928 bytes
SHA-256: 41c7bf31089bfcc4ac0c199517ef8b5af01897cea530839f7eed560859eebed6
font_02_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 18248 bytes
SHA-256: 80f8660c1e3c1471764d36dd1517eb90d74b6aeedbcae29a2fcac72960f698f5