Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e69a8c16c2e0985…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 01:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f1814894b5d30a7018c131025b8c89f SHA-1: 26d88bb7965268a8bc27b2fa118b023211787d6a SHA-256: 7e69a8c16c2e0985d461f97a4c3e9f3b3803b016dc4a56dd15c6bdd6fb09405e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage search engine optimization and compromised infrastructure for distribution. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=gat+quantitative+reasoning+questions+and+answers+pdf PDF link annotation
    • https://www.zochrot.org/ckfinder/userfiles/files/sixijudevefenogesuvenatil.pdfIn PDF document text
    • http://gibisch.biz/files/files/lejaxanuxekisosazar.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/99586043679.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da0b78cbc1a3b435daaceb1727c6efda/39278950979.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7f75a5620---gusunuvukowanegoj.pdfIn PDF document text
    • http://bakoca.hu/files/file/jalowezudulibumezodutola.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430222002971986.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/nulamobatenuvi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e76e2858b480ae880952d2ea509689e3/98155451492.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/bifajupufenowebovebada.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/aa1e2eace84434a3f7da2a286fa63ba7/7100579784.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/10112417103.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/43c37c0ed7f731f8e3c013d557408522/penoruvewelukamevofulano.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/73954556907.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/bewokevuduxetobumibilala.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i7bg57riaekhc273n65fhfsun1/tisorilofopeduwapovo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e73290c37---zuluzabaretugipipevuref.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd35a39e35---rafovijijejuwadubop.pdfIn PDF document text
    • http://twilaw.com/files/files/dunerabodivevafudaso.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/sasuruzusupipizewasereb.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/misunutogutojiluvobo.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_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 17412 bytes
SHA-256: cb33b8f96aa45295e24e936620b209c33ab89a015f4e404f8def9b53f9a6711e
font_02_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 11064 bytes
SHA-256: 66608dcc142b00db491d89b87f93fecd5f0c999ec644c9bc2fe5867b6d92db1c

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