Malicious PDF — malware analysis report

Static analysis result for SHA-256 4118831365375348…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 07:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a80a25186a0dd0bed76bad2859a46f9d SHA-1: d8c90b4b9f2ade16e342e7aedd6d40a0a8248445 SHA-256: 41188313653753480109c6f63977d6e6cee6437094218f4f2af4acd8c57d3e9a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malware. The presence of multiple distinct hosts and the use of 'super-forms' plugin uploads suggest a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/62d74aaa81fc7515c1a3d21fdf723e9c/zadas.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8hm1jg1mqtlt49jk7710jfv50q/zesujefupivatixexebu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ionftuats97o30ftn9e24ej2dv/majoviguvoburulunavimevi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/be818a85e68dc69f0827673bb364f747/98072310482.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9780219715a515da39d4243962320556/loxibefopuwonivisedapi.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/98399099185.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6364799ea2---kopuwuwuvonoserakum.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xogavojotomofexufam.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e9ddc92cd---50842238841.pdfIn PDF document text
    • http://carszana.com/image/upload/File/19899460148.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/33984656705.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/3665143313.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9591fd91755e9c1498e2a41eac227c21/910448499.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/dowasamolojunibikexunuk.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ochjskisiqbc8bmpbfs703i6b3/xofedebazefu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097e29e910d4---95006283779.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//43780266769.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160748267d6483---fuluboruvez.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/sigemujabawesuzapotolis.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160725826e66e4---xofogedowedogiwikinebi.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/21353750597.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/39835344577.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/apbq1f5out8l2e12j0qlllfkec/36953882707.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/48297564154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tfl+pdf+faresPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 17208 bytes
SHA-256: 310ce8b2e5b85e34673ac490bc8c786cd3ccc31e81497881b35b24dd8733dd4c
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 10040 bytes
SHA-256: 318910a29e9f5d127196b3dd82bdfe7c8c10301a4c8ddf6830ce2772e12c0bb2

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