Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff695bded2e63d2…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 04:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f1034087f555e4b77ea26a9556055973 SHA-1: 14a7413492cddf8422a27853b302c826c8571e30 SHA-256: 1ff695bded2e63d200ea7d9e75916d9a439d4b6277f584eea758d898f9381bc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or for SEO manipulation. No scripts were extracted, but the presence of many external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=solving+a+system+of+linear+equations+with+fractional+coefficients+calculator PDF link annotation
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9730ed94b---12333438467.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e624a0ce9029a3adab80329d45f084e0/44010721508.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a829609b03e---17419112537.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac48db8ea---kufepunedebugofimomixav.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2045109a---13421618582.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/769d9e1bf9f654df427dc58a57594cf8/refirafojagabarojex.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8725d92296301532e5689674d3230f5/donoxuwijis.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8sfc96ev88a41dk07sijt5opun/36508496372.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d6976061df5158d81dda128aa787d51f/98035269592.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5e2ec5hfn0b6gp03h6hrmdfvr2/13961653168.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/40266391685.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/628b5e73d015e28f5508d287298121df/vufakonewudo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052ddaeeeb---bukodasavakobiwijorexiki.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b93b39ddcc4---51378150392.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1789e0748293f4415bcdce3afaaa2611/ruketimenipat.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16074f9c8468b3---12711995034.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f4959eb03---kubexudamowamefugod.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/7238mgnfg635kt0rba2ftlbhgq/79539823317.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e83322dea---90008520343.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d1fde6cacceea8e89087a091861b8bab/jedazurofivibemudawu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e124767d1cd01313d36a56fe9417bd7c/11815108191.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c443552726---rabuluge.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/6uhgc16das7lg8njm58b9vh7mb/kerebova.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609122f5689eb---42136704136.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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 11372 bytes
SHA-256: 187f9a97c1ef6200f5ada7a75b3d5cdefc95ebdce865b9df6cdc7111483ebe2d
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 17596 bytes
SHA-256: be1f4d79ab565848e40991255eb48f33846ab5647999db0a186fcf6db9ca8d57
font_02_sfnt_off000139e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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