Malicious PDF — malware analysis report

Static analysis result for SHA-256 87977957fff823c0…

MALICIOUS

PDF

108.1 KB Created: 2021-07-08 11:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: da796f60863308d317def56c8cd2d3ad SHA-1: c002cd3fa7d7809210d5508b46d285c784ba994d SHA-256: 87977957fff823c0b36c575d68f6c9d32009e9e5a426bec92ac76399629e6b54
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or use disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://pistant.ru/uplcv?utm_term=income+elasticity+of+demand+calculator+with+steps PDF link annotation
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8f5b1a5b2---34742990136.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/gajoneputopiwel.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/diralokedanesotewozaxupo.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/94636590502.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8e2d22b18463646011aac411d9a81f63/89051083672.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/or95r1vtpjof48i2hgu46ef1c2/98613751505.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11001f790---71337820053.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f3335b611---96009481538.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609230df6280b---83959053543.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4747a3dd8---26855397521.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/41173417230.pdfIn PDF document text
    • http://juentai.com/userfiles/files/jovodu.pdfIn PDF document text
    • https://edusfera.pl/upload/file/sunuxabosejigibapagaguvap.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/96706533980.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087daaecf83f---kerozibubuvoda.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/473be9893baac9c8c4ffabc5c0e9fce6/7665810609.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/071d48fc2741d88504932dd070b10cc9/70218942917.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070128d8d7ab---26258868048.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/ruvugeluvinexefujewuraf.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde9fbc17f---tegewirapetuwu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/63f9853aad5fed300b8ed7d55fab5125/jebinadiwano.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ffb9bda4a---36811105832.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/rijagofagadokuba.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 11136 bytes
SHA-256: cdef1a63dfe2a5b6e52cc6ce3cba6e5f69834a980f8f6bd2f980629437f413a1
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 17908 bytes
SHA-256: 1118bc44ac7733ca09d1c75665863b0c0f9ff3f21402b7e7731444b158872182
font_03_sfnt_off000146b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B3 33264 bytes
SHA-256: b6744e09b1d757010c02a852c60334a8a879f0e00468a351d26d3d851d27c341

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