Malicious PDF — malware analysis report

Static analysis result for SHA-256 e833949d4ffdf0b4…

MALICIOUS

PDF

87.3 KB Created: 2021-08-08 13:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb613cd2b4aa402fb7003b792204b72f SHA-1: 7e417958a2b22fc0f9c3fd80f14008ed7098bbfa SHA-256: e833949d4ffdf0b449e946c79451d2eec705a171aa1b48646713aa3be7ae8e58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://accesoriosalmayor.com/images/userfiles/file/9177137699.pdf In PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d872c11d09a---kasowunujodokedef.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/28799157692.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/20783243009.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082e90f07d25---monoletesiduvekow.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2f318966b43612a8b934f71a4d2d9e78/73169009810.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/josibad.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/xojinijewifugazisitifafi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4ecd631f3bd10d3d6c2b03df8e6e8588/95625778713.pdfIn PDF document text
    • http://18554080.com/userfiles/file/livibenisaduwalufug.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/nagik.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c120f20fdb1---37567222271.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/tsdjrl99m74vsgjhqiluftnj1d/kiketefawizekarezepa.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b926b48b1---97980346171.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/11790883196.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/14089650809.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/vetup.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/9028780607.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4d2b96e1191a6a26d9c24200c6a97ab3/jajurulidelu.pdfIn PDF document text
    • http://datcat.vn/2018/file/libasoxijapexijepapiximov.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/zumifasorenixekivudube.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7429ec57---jikipabitex.pdfIn PDF document text
    • https://yodobashi-church.com/52486645339.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8e6a375d25e73ccf118270ca89c7ed17/lenitimarobuf.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608515d8db87e---90275846071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+file+a+missing+persons+report+over+the+phonePDF link annotation
    • 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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16660 bytes
SHA-256: c24198e7e3c06292f4b674ae87710914d06f77ed7e375c84163a38edf7b2acbe
font_01_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 11116 bytes
SHA-256: 84f9f5bdc2db87f3d1d4aee0ac306f87fc3ec37d9ed19c77e93c9f43bbe36b1f
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1