Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec2b2495eff840a…

MALICIOUS

PDF

89.7 KB Created: 2021-08-08 00:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8934d6113b57dd3658c4aa1644b845ef SHA-1: 5dd24e37a3ca5d52c6ddb2b98306d49b3bd00a8f SHA-256: 5ec2b2495eff840a6d0e7e173d3f5ce068382c3a192af48ba63a1f77caaa3030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure as a link farm on disposable or compromised hosting further supports its role in directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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=rivals+at+war+firefight+mod+apk+unlimited+bucks
    • https://jmcoverseaspvtltd.com/uploads/files/rubofeguk.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/balirobatovuxa.pdf
    • http://uptownchantilly.com/uploads/files/dotavovisov.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/21e437f86957d00b5df54d17f57ad8bb/sixopupux.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/22d36a7b9341aefff869fd902fc48d41/61275045208.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873969cec48---10359751218.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/kozigupuwiletakoluzazak.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9dam0pavoi75hcieahm7ecvhv/pusatovexuvulokazimamafu.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vh7pa98j5fk99ham512rhtv141/fosulamapopanad.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/93fb10bde185ca479330a1bef688c8ff/52347009213.pdf
    • https://ihotel2b.com/upfiles/editor/files/juvav.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/47325dece6255f7d0efba51cf8d33177/3888231674.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/i8l41jk0s6dksti0gct2odeluk/96492873875.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/zepubomusilox.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/74398394490.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d00h2daj6uj6batsarqjr01m2d/7923115607.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7656be8ed9---podegusudepononufug.pdf
    • http://bmsorganica.com/userfiles/file/16400213805.pdf
    • https://tamphuctriland.vn/upload/files/rumesako.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eb8aa831bc893612fa7022c6ddd22780/58672349379.pdf
    • https://alatheir.com/atheirwsfiles/file/wegudalowid.pdf
    • https://harom.ro/files/file/9805312055.pdf
    • https://bamor.org/userfiles/file/wixozorolujiwuzuwajus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84c.bin
372ef3d8d8f0755e5d6c8ce3a987984f03ff80395be4749276fdf49c507ced61
pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 17016 bytes
font_01_sfnt_off00010500.bin
6db0f6aff302517959e771341526719c7cb0bccdb624e9d69e423217ff3f1916
pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 16272 bytes
font_02_sfnt_off00011b0c.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 1692 bytes
font_03_sfnt_off00012314.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 16792 bytes
font_04_sfnt_off00013b2b.bin
0b56cafafcb71448a22f7892ab859f6419cf67aa823bd537eab53fc9c3777685
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2B 11596 bytes