Malicious PDF — malware analysis report

Static analysis result for SHA-256 685fa99e9e7e176a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 18:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b798528aeee3ea764077dc2fa1b021d SHA-1: d3057e403d7847cfa96a64caaee97c52de2b25e6 SHA-256: 685fa99e9e7e176a0e7622dad2e38243ee527456d13177603b9147ce1b639229
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm structure points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://presstone.hu/userfiles/file/7926269477.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c67e370d950d943027eab312b3e7c388/wenisibiri.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c6b56ef34---funitopexunatow.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/76207080925.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/71251769390.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6e2d4b473f3f9463cd4f82cebaffe2df/tawisavolunif.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f563a61e30---fikojepitilajumonikapo.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/431acf6fc5a479d63002333fb00870bb/26616038667.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/9535504053.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/67924973228.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/vixagawiwujuvevo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16115bb5d0003f---59998879605.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/90ec370903a069787bff4381c623793c/69175617830.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/dewidukagib.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/luluvej.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/rovujigupamofadajugo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/45034032698.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ade7bb23d---revukovovozomawamomak.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/ronewuwazepexirufuxawepu.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/gedaketup.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f5f9833c6653b0db6f0be9bd877a8326/48871870508.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/1645479320.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/vebuwenefepuzor.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/paposizasovemuvijemesezux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=morris+philosophy+of+language+pdfPDF 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_off0000cf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF09 10888 bytes
SHA-256: ce15633f1e8f2d1147e47371a3960cd713e287aefe8b3f654219d98e0db2420d
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 17512 bytes
SHA-256: e88d1a363867544a889a3a6d52dd8689d10b9a1901ee489ebba0f578ada58e18