Malicious PDF — malware analysis report

Static analysis result for SHA-256 a982c24bd3f3eb3a…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f6967fa37eedd45cf7920a94fe9c243 SHA-1: 813f9ec58118e3a864d0ca6f877f2d7278d30257 SHA-256: a982c24bd3f3eb3a8cd571b6360698c074632f0bb5929db3bec7242348e1e3aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous links and the use of 'utm_term' parameters suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://smidgel.ru/uplcv?utm_term=understanding+abgs+made+easy
    • http://ymy-tea.tw/upload/files/74825570934.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8443323033---mozimakijuworubedez.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/zibidofusaxonagil.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/3818023870.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7645261116cb68fdaf9c3ba2b4143d93/pebivafunafavakodifem.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/juu018l79fob4ushdoidjhse7l/67683620394.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f345b324---74272896184.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/819b91286ee1832a979a5c8b72378c9d/24212910873.pdf
    • https://ipic.vn/userfiles/file/renam.pdf
    • http://amon-syotengai.com/userfiles/file/41163239724.pdf
    • http://littlepearlbooks.in/data/eimages/file/lipipijozowoluv.pdf
    • http://bobiniauto.com/userfiles/file/61413741248.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b27a85c0---34655477851.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16082a98bc8e5e---wenumo.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/kfsg86t8vttf5vc4efpe4n7f25/lebizufimeta.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9acaf066---ferizirefujisoporelotigu.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/76ao67ftoe0dekmujkbnvo4ljr/donisukilitabawa.pdf
    • http://bscartridge.com/pic/20946926028.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4766e0548---54422208042.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7686dc14d602312072db03747092b5bb/83493124940.pdf
    • http://fautographie.org/images/userfiles/files/xuwom.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07073ea04---79739333906.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb00261d86---49439708853.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/68889546759.pdf
    • http://nuovartea.eu/userfiles/files/48475923036.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 16792 bytes
font_01_sfnt_off000119dc.bin
01109f0314a31943e421bb6bf770a7134ada0f537e819378f457447d39fca6ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 17080 bytes
font_02_sfnt_off00014662.bin
320863336ae66a075b2b335b3564cf82b4e21b09724e96e5e36989716182abaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x14662 10684 bytes