Malicious PDF — malware analysis report

Static analysis result for SHA-256 f877932a90d511be…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 16:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ff18cdabfb2eb0681194aaad298566c SHA-1: 8fe405e14f396a1a30509e9ce92f8cb68004f24c SHA-256: f877932a90d511be3d37ebeb2f3ac9eedf33d906e53335e10ef54136aa1d769b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://medvor.ru/uplcv?utm_term=find+volume+of+cone+in+terms+of+pi
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/alf4g88v79e2k1ckg9daphs0rk/53176337721.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ad009cae---kunolopujuvamuzevukanuwi.pdf
    • http://www.kilincsweb.hu/fileok/file/danufetetitakosikulisa.pdf
    • https://inifd.london/uploads/file/kikikibus.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0d91184ca982b97bbaf82fb519f586ea/29426330568.pdf
    • https://moto-trend.cz/public/files/fck/file/84060146449.pdf
    • https://dock-levellers.com/upload/files/68870815640.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/tekokijujefujawe.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11986f2853---52269926806.pdf
    • http://7tec.ru/userfiles/files/47782483113.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eac7c153---kididuzitobiwovanil.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d815aa83e96e53e70cda8e9bf154b3ed/79478384823.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29b6bba67---93994813600.pdf
    • http://georgefamilyreunion.org/clients/86186/File/18064955673.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210623_B855D732931EFC2E.pdf
    • https://elitstroycraft.ru/source/file/funole.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160989169f2ef6---63723603152.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/3824490786dc8dff43458b8f4f60e202/ratijibilipujo.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/l50j4i7igssvi6o9siilp7mtu7/vemibaximakafad.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d23ec6b0---22056276007.pdf
    • http://kojeneckezbozi.eu/userfiles/file/92207988187.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6405e8d623a8b9325a53cdb942dc79d1/40390451439.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5276408206d2a80e3902fa2d094136a9/munogowis.pdf
    • http://carolinaboatclub.com/userfiles/file/mibezugolix.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ji7ifq2btr0torj8e83l71uhu7/55702472859.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8be33fa34---nelevudorabomepip.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_off0000e563.bin
6c01224516bac0c7cc2f0deb036efc5df15981a42ae4bc962b1411dd16769e36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 18240 bytes
font_01_sfnt_off000115f7.bin
68b418e9067ec24db75225d31ad4c3f552d9952abf1c2e326090e615636d63fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 10764 bytes
font_02_sfnt_off00012ea9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA9 16792 bytes