Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f9b1346d8752e0…

MALICIOUS

PDF

91.3 KB Created: 2021-09-24 12:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b837ac1267ed85124c264291aaff6fe1 SHA-1: 532b9b31c3977030eac287a71145fb149a145e92 SHA-256: a8f9b1346d8752e072a1f52910a58647264172a425d43da3a260ee9c1b2f5811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to lure users to potentially harmful sites. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=nes+tetris+online
    • https://cafesca.info/ckfinder/userfiles/files/dibixiveromopiwe.pdf
    • http://sadvita.lt/pav/file/bomewofiragodoriputili.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/vuket.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16148a651c4834---54668565011.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613078aee8e54---salapajuja.pdf
    • https://bevillelecomte.com/ckfinder/userfiles/files/24317603023.pdf
    • http://12shio5.com/contents/files/xikaxozoxazuw.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/3017335036.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161354ca2178e3---35253245325.pdf
    • http://spbmedax.ru/sites/default/files/uploads/wuxixafafexelogu.pdf
    • https://mobspace.xyz/web/img/podborky/files/51543705406.pdf
    • https://aldapa.eus/files/galeria/files/jateverasipakulevume.pdf
    • http://vincitydata.com/uploads/ckfinder/files/vedifisararegabekaxezigi.pdf
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/powopel.pdf
    • http://tw-echen.com/uploads/files/202108312254356328.pdf
    • https://artasedanasingaraja.com/uploadfck/file/57010773838.pdf
    • http://tingchucontrol.com/Uploadfiles/files/47274151993.pdf
    • http://studiofelician.com/userfiles/files/vafazap.pdf
    • http://bouwbedrijfbouwheer.nl/userfiles/file/worigodevupezunadarigex.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc775052a---vafadaxes.pdf
    • https://xn--fiqa735be48e.com/upload/files/giwejipiwukabu.pdf
    • http://abcs.umontreal.ca/upload/files/27662182921.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_off0000fd79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 16792 bytes
font_01_sfnt_off0001158f.bin
65dc0d32e14d1df37a73a69d54d360ae502031f5a297e9c3b7fe30c19497bce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 9916 bytes
font_02_sfnt_off00012b8e.bin
d12dda239e019692004a7bc89cc36ee82d342534be730259bf33587525c22cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 19828 bytes

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