Malicious PDF — malware analysis report

Static analysis result for SHA-256 287eaf0d55f8dbbd…

MALICIOUS

PDF

89.5 KB Created: 2021-08-11 23:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5a2b56ba9fdeeb8590bee7809aa23c6 SHA-1: 77c4b081fb69650cd05b16edb6e781f1486b15dd SHA-256: 287eaf0d55f8dbbd9af7792af5a1eef5ca194e8a3066162b6524c7d8218abe97
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. These links are likely intended to redirect the user to download further malicious content, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=hindustan+times+epaper+hindi+bihar+siwan PDF link annotation
    • https://gmt-tw.com/app/webroot/userfiles/files/10294939121.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8adcbd58fb11a53a280547c9b1766fa6/komebesatufelawakibolafe.pdfIn PDF document text
    • http://metall-press.ru/files/kopizoja.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/wawazozadowi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/85f78894219a518a85f32b27e4d631b8/dokuletebutifad.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/76760707214.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///wafiguwuz.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xiwetagetaj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759ad57ab78---sonun.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/q1hsaa7bihs7tkju8gu4o0e248/38376123359.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecbe309487---jineg.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/24106926971.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3d153fe380d1ce890fffe17cf46b94c6/damovikidi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0ss2ffqd8p74fqupmvs9fflfmm/12984100120.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e2e55aea---nazakonofowobupokajeg.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/79733829531.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a193b8e14ef3011224fb76e71d01a7cc/zigepofinoxazalisutum.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/susuvazuxadojijazureko.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/12934843920.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3ec086e4b96e399329d964672813def4/51603311834.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/25016757171.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/sexobibabawazop.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/xotujogaf.pdfIn PDF document text
    • 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_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 10808 bytes
SHA-256: 1fac22aff8691aed83f41177b449aac15eb38b16e9e9860e37b760c961a01d06
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 17788 bytes
SHA-256: c13f7cfc4a5a9df88f6d9b5ea512c3eb79e6db77d932043f80b903776829da0a

Open this report in the interactive analyzer, or submit your own file for analysis.