Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a72ef2f8edfe8f…

MALICIOUS

PDF

84.2 KB Created: 2021-08-30 00:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e73f3e84597db20733bf2452212dd96a SHA-1: d01e07c0e1a27d5743041cf64431643a00980dc8 SHA-256: c6a72ef2f8edfe8faae2eb6df4f5f000faa166629fb3cedf019375f06d1bbce3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=kevin+costner+sean+connery
    • http://thanuyentea.com/ckfinder/userfiles/files/50814090117.pdf
    • http://studioaba.net/userfiles/files/79937492959.pdf
    • https://cesiedizioni.com/userfiles/file/newemevoxolakezanepuwum.pdf
    • https://zhavezbozi.cz/data/file/53825327216.pdf
    • https://alperbehang.nl/userfiles/file/96244092349.pdf
    • http://bonsite.nl/phpcmsys/file/zazakiwurobo.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b1e161d0e8e3f05522689e0f48a18a4/jeninubokuzi.pdf
    • http://taxplus.in/images/contentimages/files/zarifopojuwisadafafiwi.pdf
    • https://rijst.nu/userfiles/file/finozojob.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tos6reus20dprjatdjdbupa4dp/53929760923.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/378deufal3hkjm1t8cn2o8gi3d/vanipebu.pdf
    • https://buka.ru/sadm_files/92435020289.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae73adc3b1f---90365084947.pdf
    • http://startmatbaa.com/userfiles/file/zelebasegafifevesomo.pdf
    • http://usaoxin.com/userfiles/2021-8/file/99106041104.pdf
    • http://gardensyellowcab.com/admin/images/file/98482102289.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608117e872bd1---37194888713.pdf
    • http://apsara.ru/userfiles/file/63654857457.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/vitevelukodasagobe.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/33416229607.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jmucnj5pk3lb6dnmkrit3kkb6s/37526556973.pdf
    • http://shmgec.com/Uploadfiles/files/samipibiluzovotobedal.pdf
    • http://iberryhomemade.com/userfiles/files/47547545101.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_off0000e21a.bin
e8c69e51168e193eb6158ac8fcf94eec1075d0bbf252e16a4722371e7179f5ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 10348 bytes
font_01_sfnt_off0000f9af.bin
999a1e66be41c2653e4b7de237b0f691845e3fc4ac378273d05c421bd33d83a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 19152 bytes
font_02_sfnt_off00012ae2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 16792 bytes