Malicious PDF — malware analysis report

Static analysis result for SHA-256 890c3ccfccf7690e…

MALICIOUS

PDF

90.8 KB Created: 2021-07-01 10:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86274945fe6c420a5d29eb7391e268c2 SHA-1: b36af3f4f70aa07445a4292c77fcd6a1839b60d0 SHA-256: 890c3ccfccf7690e5e303d0b786b779dc9103f83c833659501b4cc0f756d62f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=cartesian+plane+drawing+with+coordinates
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9cm6sp8kljnqhj8a1vt382cnnt/nexow.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/28faffb82287f2f3ee9f65b94111eb9e/nipulubadapakaxomofefi.pdf
    • https://uleshuzataruhaz.hu/files/file/82806977396.pdf
    • http://jhdjt.com/images/upload/File/guwefib.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ta8ggfvkq0a9j3ngsnd1edpclc/kesemekuvijisesidevil.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8977abb823640ca7b1d64a9d80d102f4/44039112363.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160835e9e11841---namekadegewogadif.pdf
    • http://akicgiyim.com/userfiles/file/dovititivariwewazoluteb.pdf
    • https://chmelo.hu/sites/default/files/file/xotitogojuwewerigox.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/14b1b04dfaf146682a64a261b1a660b0/86395151545.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d081378762---44526831581.pdf
    • https://sunarchegypt.com/userfiles/file/pawusitelamafa.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d1458f7fd4b5cce29820640fbe078f38/28929194583.pdf
    • http://classicalgardenornaments.com/uplds/file/getipevojeku.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0337e7b6034ec019b82cc28ccdbfbf53/19428739770.pdf
    • https://west-holding.com/userfiles/file/29809262153.pdf
    • http://epoch-making.jp/js/upload/files/muxaziwuvovuko.pdf
    • http://immobilieninvestors.de/userfiles/file/17641124408.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fdd779b6---2824192447.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098f426abbec---zotudinudenubotevob.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6833f2f8c---89218184843.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3708e1752ea8640a4dab9420cb50a66d/dumazijakofuselovumetozig.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6aaba433---bewezowedopaxivigewapof.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/bulatusiwixib.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_off0000fd29.bin
36f0ef2674d8040764dd1b53e0a4478595cae68e7038408787dcf66c3a162983
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 17456 bytes
font_01_sfnt_off00012ae5.bin
a23290dc36f2ff419e7266f90aefa899a151783817cd2be631771893c394627a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 10912 bytes
font_02_sfnt_off000143f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F1 16792 bytes