Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f5e3eb2f7619c0…

MALICIOUS

PDF

78.9 KB Created: 2021-06-28 22:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95d9e0a11c3080fc5405a39273ef0bc2 SHA-1: f610d8ad47990871765010b4cc267486233f6d7f SHA-256: a3f5e3eb2f7619c09941a04687bcd41912770c01c06b69ca3ef59f12e28c4aa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to distribute malware or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=how+to+convert+a+video+to+a+pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb1b9c9479---42422521630.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/d732be8438f3ae7b1e4ed8d9ae76d195/93270105242.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a044eb67d39240e9982f5725db7461dc/mokodujoditoz.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4557661a52---komelow.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/xalur.pdf
    • http://arniestribu.com/campannas/file/40118106694.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j3dqbmgel6sdqi9j4ouhuc79t6/gidazagofovupos.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf05e154ff---86625980306.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/655cnvk9s1r6j7taumlnsnko6i/wivigugutabikiwizot.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b76ae54a86f6692085a6585f7c540241/54233418429.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607975d4ebe09---34741301111.pdf
    • https://hissekurban.com/resimler/files/giridinobofexunekez.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607923f223160---7695696348.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba53cb5c41b---94897487187.pdf
    • http://baaningdoi.com/file_media/file_image/file/gelinibipilezomu.pdf
    • http://promador.pl/userfiles/file/sakigofim.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/8p1seaf42l56kchh7j8mjgq0qj/zixig.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/465d584dce78f63a1acd4330d0f7c404/22520231581.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1d31d1af33148376cccaa37631ffa0c2/vudozaxagiwesupano.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c667b0631f---1048392267.pdf
    • http://thermcom.cz/userfiles/file/55510291904.pdf
    • http://kayapaliinsaat.net/file/45053855245.pdf
    • http://ahsaipu.com/v15/Upload/file/2021429930567974.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/61398717fc115797ceb88d0a2583f418/59924108202.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_off0000d2a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 16792 bytes
font_01_sfnt_off0000eabb.bin
96f2181d87e29a610fa94610bd369b729142e33e068dee9026fbec4e8a9cf7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 10544 bytes
font_02_sfnt_off000102da.bin
5f298a9290370c937d7cf02485531678fd7cc418a096c66fa7139c85d4517b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 16880 bytes

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