Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12dffe983dd345c…

MALICIOUS

PDF

90.1 KB Created: 2021-08-06 09:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71bd2abdad9fd285d38a68bd4f147c1b SHA-1: 97fe34d317e1ddef0ca98f633474bb0584fb48f1 SHA-256: a12dffe983dd345c8685b801bc56b41e9baad1129ca165f258b33c2b0acfcbea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites. These links likely serve to redirect users to download further malicious content or to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d738d76fd4281543457300c2bad39b7c/defodiresofa.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/1a49f14e9a32c71d84933fafb705013e/28668867364.pdf
    • http://agiusfuneraldirectors.com/files/file/denezaw.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e11c9bca1f724265304253851ac0354b/kovuvolog.pdf
    • http://zhengfutz.com/v15/Upload/file/20216374449420.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8d76fc4178372a3f6e5d8c009fbf6aad/zupasotegaxanesekedat.pdf
    • http://medrea.ru/upload/files/wuwovarazutapadoxakoka.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c39022935173ab09b70f0beab9337196/tevovomukarowusowisupa.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb2346573---gizow.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/268215479237fbf9e18a5f147d561ab5/rotob.pdf
    • https://haysalon.com/public_html/userfiles/file/88949971844.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de9bdc5e3---5928714444.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/79863373636.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3b267c190d087b65e671e8484eb08777/sibufoxitakivim.pdf
    • http://tupnate.com/ckfinder/userfiles/files/vifolofivilenufewi.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rmn96vrghss73sgje9bo146p59/84762323891.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/6vk6suddm5osn41qfkaf7tur5l/lidaxomagopevuzesuxoga.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mirbcgm6v27ick4sf3rtfk6nb7/tokulanazarutuxabebolep.pdf
    • http://barexkft.hu/userfiles/file/15112742565.pdf
    • http://akkoryazilim.com/userfiles/file/kopemefum.pdf
    • http://fzsvybbs.at/userfiles/file/98282971292.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefaaa9fb0---zeputenab.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/nalagigapok.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/j8fsnvndv7dvsel9rhuoru2e0q/danakatoruronuvi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=letasoft+sound+booster+full+free
    • 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_off0000fcf7.bin
eedd766e7d2eaf079b30d916be4afe91c99c983084b3dad1f5e7a5fb85d582f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 17020 bytes
font_01_sfnt_off00012976.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 16792 bytes
font_02_sfnt_off0001418d.bin
0bb1362b9af4f8f1f5f214036ab53df30b78ce60e7a0abc63c6461d1fd54174d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1418D 10452 bytes