Malicious PDF — malware analysis report

Static analysis result for SHA-256 840fa93d8ade7433…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 12:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8af6d0c53e1aa4ea0d089d473ac68be1 SHA-1: 15981816ab387ca40c023d8a90ddddefac7ed4a0 SHA-256: 840fa93d8ade743393e5d3277fed22425d0f262466031b3a591e7521f83e637e
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous URLs, many hosted on compromised or potentially disposable domains, strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b337e057db---27480867141.pdf
    • https://detectiveoffice.net/userfiles/file/3946904253.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b883361d30e---13136479632.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/30428412045.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecdee3d869---56029407065.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/187927fc5d1a534328158872f2812e41/xevovuwad.pdf
    • https://dentalrud.com/userfiles/file/49718067359.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840ebfdf72e---xewopudizejan.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63d0c8c06---22247974038.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/17927611758.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/16b1f7722e4b907a5b072d002a2d6d0f/razafemofelilowoguji.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/37b7230a02718384b38275a7fd3381cd/vobomuxiguvebajapi.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a876e734b73---72250076630.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o3u94e0ho7t51kas6ls7gb8iqm/15029940246.pdf
    • http://wccflooring.com/userfiles/files/60132941773.pdf
    • https://zabulgaria.org/userfiles/file/fujasezavusixerexonepeliz.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d3156b6f47f4df3e5b8a279dd80f6633/pemewipenis.pdf
    • http://greenbrier101.com/userimages/kazurumemuviwalaxexifara.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac8a20bf7---70505432328.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037d39f32a---gupozaluwajike.pdf
    • http://dekoblickfang.de/userfiles/file/4712461076.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45d1193d9---31015776202.pdf
    • http://pphu-joanna.pl/fckpliki/file/65311523233.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebb9f77c9d---fidunexosopojaw.pdf
    • http://dajuicebarus.com/uploads/files/5096063219.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/falopefirovixeditujilox.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/atfrk4m1gvg0sidr6uk7jqll13/daromogite.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=explain+the+three+tier+architecture+of+data+warehouse
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f133.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 16792 bytes
font_01_sfnt_off0001094a.bin
7ddc6051328b7be7bfa0cac80c5e82a46fe02316cfa868b21b35390803bff4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 10988 bytes
font_02_sfnt_off000122cf.bin
1c7208a335aa50022b1541408915fe7a52dc933e79ca4c575e7e4bad32f534ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 16736 bytes