Malicious PDF — malware analysis report

Static analysis result for SHA-256 971d2488a2729580…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 01:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0b0ba3b8b8ce922de3d97cb1a472853 SHA-1: f48c48940558d170bab0d994a21355aebf21a221 SHA-256: 971d2488a2729580c10df4b4d641a29df637662a47faa6267bfbdb601d69e6c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=its+play+time+quotes
    • http://intergeored.com/upload/File/90672166224.pdf
    • http://kemenyseprosiklos.hu/upload/file/76781027677.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b09163b96ff---96681507645.pdf
    • https://daismene.it/file/10386384991.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fc3fa1981153d4e2da6375da2ba09ae/xidenaxivov.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rsqiqu0pnsjt5tg78sp4ijcch4/badoka.pdf
    • https://brianhigbielaw.com/UserFiles/file/sigasi.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/02ldfp47fesadl1oisidr9plm1/mibijimobunasijax.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b572600eb07---26402532745.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489915a12e---14163599546.pdf
    • https://llibreriaha.com/img/events/file/52735089323.pdf
    • http://agendaalzheimer.org/files/galeria/files/20998153750.pdf
    • http://constantemails.com/userfiles/file/1623304726risorijelomaritejitisuj.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c7583382---79490236311.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/0nkd752at205ioahfm129d1a67/90419346649.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9626bef3f---84199045830.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/nu16e5diouta87uhr0mf1ns987/mewurilulewuxixewo.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3a36b5cc3c04b3e56c18ce8ddbbecd3c/zukosidusebuj.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4bbabbaeed6bc8a11f154695327d2fab/gakedonoleluxunupo.pdf
    • http://nfrostov.ru/upload/files/jurokuzexa.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3be70fbad16495da765f5b6cb9864262/20191751295.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac022c15ab6---61499670871.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5762892e6be3d7005c63d75e25756c5d/21577258647.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_off0000f041.bin
1a1eab591728acb2476f5e611c2417f8efa571c39c8b5439d5c0cb39f67ac519
pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 17084 bytes
font_01_sfnt_off00011cc4.bin
81212f62c9440646d0e0c9d048609ce6555c6886d35c3cdef279203b4ece534c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 10520 bytes
font_02_sfnt_off000134cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 16792 bytes