Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9c59316449eb65…

MALICIOUS

PDF

81.6 KB Created: 2021-07-10 05:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 109b9da5d5c00bb495bc7586436bebcf SHA-1: 09286cfa3b8ec7e995f2ad9e7ac1b44a5e3eed0f SHA-256: eb9c59316449eb650c4575dd1b049c5188cfa02925ac2f0496dc16eef626cdf3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of many unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://jingluo.net/uploadfiles/files/24704021045.pdf
    • http://extracam.es/app/webroot/arxius/file/93079028467.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/44086342478.pdf
    • https://acgroupenterprise.com/userfiles/file/63589841661.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a389e6bc0c1---desukututemapowamowo.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c6b2e0f7---62692768104.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba952418a1---99577649487.pdf
    • https://myphi.biz/nbloom/fckuploads/file/10404924231.pdf
    • http://web68s.com/upload/files/vejukipugajulif.pdf
    • https://devcons.org/uploads/userfiles/files/73732100016.pdf
    • http://archinfo.ru/uploads/file/risexizukiweji.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4a1506f4aa32c4ce8684d42c4626b27b/74986426697.pdf
    • http://pm-ural.com/uploads/files/laselimomuzuv.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090481dab583---gavubiwufabasebixupawubeg.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2156db8701e2dcf4ae55d7b412f33cf8/86261588314.pdf
    • http://nordicaluminium.ru/userfiles/file/gilinavilatijubudomebudiv.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d552a1d3---benarapodetis.pdf
    • http://rauvuonsach.com/images/uploads/files/22002589691.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5e5a2d125---xutigapikemo.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/48937307933.pdf
    • https://menlopark.com/wysiwygfiles/file/7807862262.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c107b6fa16228255e295be74d330d6cb/dejoropemunel.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/08be0c24250cfb5e631a3a035e9f07ec/26619031327.pdf
    • http://iziusb.com/userfiles//file/nisowexomizuvog.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ec65e1dbb8ee044b97f9095bbbeb26d4/pebugafe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=battery+swapping+technology+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_off0000dad9.bin
375e42a5de5041f51031200a1a74cbbbc6258fd3debf502c583592fcd33b1066
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 11152 bytes
font_01_sfnt_off0000f4bf.bin
606cc363076ba032fff9703fe1bb0e31f8d7c946f5f591dbb3ff66fe4bb9198b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 17064 bytes
font_02_sfnt_off00012129.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes