Malicious PDF — malware analysis report

Static analysis result for SHA-256 a941566f2cec16da…

MALICIOUS

PDF

75.0 KB Created: 2021-06-25 19:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7af88bc2e7916d9cc3d6c05da6fc1cf5 SHA-1: 59a8cd683db7d4acc1589149fc4f13cd2fcff5ca SHA-256: a941566f2cec16da09d19b81d61c2b490ad07e3ad6ef2d35396cd1b951746db6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bc2ffac4bbc27ba771b9d4fae9dab861/kezewazixuputovibekul.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2dd681423---22652419114.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9jqd668mvkbo1npgds2sauu0te/ridutifudevewovupu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac3dbd252.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/netujamivevovozozuga.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/40b3ee6f0c897f0e6e4dd5e0d72f4ec5/nukedavafu.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ec513d79---popeb.pdf
    • https://x-software.cz/data/file/minofetifa.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/841b06c0e5a6ac3d39dbf2d343252c6f/527695015.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a0c8ba77ae0b9108c650855bb9f6f9aa/78996958650.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210624025321.pdf
    • https://dobre-akce.cz/media/files/file/91721104005.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9e25f84794f82539ff669d8a696474c5/40813304872.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/uupeklf43hiih1djh5p36invc6/66416608721.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e306276a43e678c25d2df02918986e7f/napedizujulizise.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/fa2da692a98e1142d770029bff058e2d/rinawuriwupewimi.pdf
    • http://allasclub.com/campannas/file/65748645111.pdf
    • http://arablift.net/userfiles/file/28362589445.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ecd55c15d---wujiwajaguxofewabiv.pdf
    • http://technestudio.eu/userfiles/files/33004921601.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/685ff87ae46920424091372f49f6c957/momufivifo.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3153dbeb917622f551ba5cc1c6074d03/jupazamupafep.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/af4fb9b277abf73efa514c5d3ca40963/majowokabatoxomipikewoxoz.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/vololoxatarejebofujogakas.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3291a7tban6upu06g6805kh41/bomedelokifukif.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0d2bdc910c5feccd8633221578e2c9bf/41248727431.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b7c220b000af806da3427b1fa5187e78/lojerutetigubiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=matlab+solve+for+unknown+variable
    • 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_off0000c41d.bin
29e0e8c62df66c25f8fa2957dab210026200a06e9c40ad057fb9a40e4fae0557
pdf-font-stream PDF embedded font (sfnt) at offset 0xC41D 16056 bytes
font_01_sfnt_off0000edbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 16792 bytes
font_02_sfnt_off000105d2.bin
79f441441de7ebc32a621354cd2c45bb976164c5162367e561501c9b77211b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 10684 bytes