Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c791b9067bccbb…

MALICIOUS

PDF

88.1 KB Created: 2021-07-03 03:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62f6c75277f9ef061e447935c90d8f19 SHA-1: 9886c732b48eb678eedefdd1e29571c6b83356d6 SHA-256: f0c791b9067bccbb6126befdc795755a1e7226c7de8e5c8a908ce8292d0d9af8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into downloading further malicious payloads, likely disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1b445c13789b89a58e0542e61a6b1a24/80268508043.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c27979c7241857750d22989a87faa4d8/nizoxirasaxenonelukowun.pdf
    • http://omgmediatank.com/userfiles/files/76930599626.pdf
    • http://jnafarms.com/clients/864068/File/duxulike.pdf
    • http://petrduchek.com/files/32732947050.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6631fe50---35505464041.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/xizivilovigoresegixa.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9281031b3---pasokesojemiwira.pdf
    • http://scamps.biz/userfiles/file/28848135110.pdf
    • https://lawrenceyezersky.com/userfiles/file/geguritud.pdf
    • https://egokituz.org/files/galeria/files/borafapexif.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/32b7a3d97a9c0d95151fe52f34eae8de/mugefojijiwizuwejetud.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dd17b7b1---taxeruwojurubedinemitaj.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lrn35if7o18du3nqh5noasi396/86782215920.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j53rft3d6te2tvj78u64tgm7l5/48858695994.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6057759275---jikadusakil.pdf
    • http://cuuhoatudong.com/upload/files/gakarutokajaxi.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e70562bd---wozazupazoduxo.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c543273c6486906015c23a1cf46834e2/zukowovabivusudemukagu.pdf
    • http://findmecakes.com/userfiles/files/rixefovinerajawofub.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/96545f530a1235085effe89c7838a0ab/69144455942.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a77279c2b---lebebilirabon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=java+microservices+tutorial+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_off0000f2a7.bin
8f3db52a648b45550cc4bf1759ea206e00984faa6f0617fb2ea1770d21483ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 10836 bytes
font_01_sfnt_off00010bb6.bin
01207f206fac4014d5e578c67b691c9aa9eca69d62de32fc23b1679ff88a0af7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 17968 bytes
font_02_sfnt_off00013b40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 16792 bytes