Malicious PDF — malware analysis report

Static analysis result for SHA-256 835f2e4b7a1e4f6f…

MALICIOUS

PDF

98.7 KB Created: 2021-06-29 07:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd581afc976588d25b8907a15c8b2877 SHA-1: 4227b0610252f9afc0cea5546577aefcf75e6cd9 SHA-256: 835f2e4b7a1e4f6f7961db5ffab9cd9c686c673003ed74640e99f53dc30a40f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f11fbe141---jatofiko.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a21628583c0---49000467409.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d1feb0ec---betetepabufegop.pdf
    • http://project-st.ru/userfiles/file/53444610555.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0ccbe3a9f9ec9d1d487de5430f666cd9/15269010712.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/471c9e0400ec797caf2ef366fca6ac39/1012733796.pdf
    • http://businessvaluationapp.com//fck_files/file/27104028169.pdf
    • http://shinies.ru/img/lib/file/53514164399.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095186dd6800---10231283049.pdf
    • http://wawabed.pl/uploads/userfiles/file/91361938952.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/eq4eth2mdlkc1nkiu316e25cbe/64705371820.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/387cn9760r3sr7ejvo0k9ge9gq/80986954997.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ea542ce50---zajanebo.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/givexeze.pdf
    • https://arerp.kr/data/file///bedozefojunibetezopokuza.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827c8e8c4b---sexumovago.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b7eeada2c---nodusurevujilavubifizex.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708f47e13e5---farogosulonemetug.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ab4695be3e886af9a3a42e6b60777273/gomuwofugin.pdf
    • https://bhsbeacon.com/FCKeditor/file/jumukefuf.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddfbdd573---54102675238.pdf
    • http://bigandtallking.com/userfiles/file/bonufazapebitizumoxiwuwer.pdf
    • http://hotelsandmartin.cz/files/file/nuwatuvamofamenogu.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/33afda8f30aba5ff5faeb3813a049737/39850785134.pdf
    • http://washchienluoc.com/upload/file/kefexupefakagobozukasir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=women+during+the+great+depression
    • 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_off00012044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 16792 bytes
font_01_sfnt_off0001385b.bin
6c74fd8c85637f52e01ccb4b6d46b54940bb515d583f6371f902761fe166dde3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 10884 bytes
font_02_sfnt_off0001511a.bin
408a4f37759baf75682e4974c12ffc9dcd54171d995159fe578ca214c1207849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1511A 17044 bytes

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