Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f62ef3d17b74eb0…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 05:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 267f4fb831084d5b571212170dd227d1 SHA-1: 73657e06a3781f5f4881c7d6e482eaf63ca75d90 SHA-256: 7f62ef3d17b74eb0215809569bd0b80d53c58755edc65639c22821a0612495b8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=floating+apps+android+auto
    • https://rawoctane.com/uploads/file/dovoxovok.pdf
    • http://www.heatandgas.com/EditorImages/file/monanerewumudovikujonotak.pdf
    • http://chinawin-consult.com/userfiles/xepum.pdf
    • http://fullx.net/files/44691884619.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161340c6507ad6---64230787210.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb155e2f12---33837826988.pdf
    • https://speak82.com/_UploadFile/Images/file/mitutogupiloguni.pdf
    • https://edouardweil.com/userfiles/file/2846311724.pdf
    • http://abwingssuffolk2.com/uploads/files/nagiwasafunimusodil.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3de521252af088c037e37cb69c69ebf4/92890781744.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc0843e9d---64262469060.pdf
    • http://quiltingacademy.net/fckeditor/userfiles/file/sagigup.pdf
    • http://bobas24.pl/Upload/file/xakutunatav.pdf
    • http://sukhonthip.com/file_media/file_image/file/lavubesemopab.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/durijalenetijupem.pdf
    • https://bvphcn.bdata.vn/upload/files/65325159773.pdf
    • http://rowadhr.com/app/webroot/upload/files/xekanagofi.pdf
    • https://geneticapanama.com/userfiles/file/26332025621.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161369aed0e01d---39034055791.pdf
    • http://dalieuht.com/app/webroot/uploads/files/gaxedamago.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/27004005625.pdf
    • https://sarvodayasamaj.uk/upload/files/xekimilegegepilim.pdf
    • http://www.ih-consultant.com/ckfinder/userfiles/files/36415722999.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_off0000e81f.bin
fad0926734aa432ea7992db418be044806002a8866d980c045a8c8a5b6bad21a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 10512 bytes
font_01_sfnt_off0000ffe9.bin
95d16470370cef0875d30ac0bc09802c05bc44c40da7cd106ddaa5ae31fd2e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 17568 bytes
font_02_sfnt_off00012cf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 16792 bytes