Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39d9bea3e7a7de5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 09:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a8540ce9c78ca89c758dde298bbdfb7c SHA-1: a883b98aebad191426de8bed5e16f7c099e0898b SHA-256: d39d9bea3e7a7de556111a6d7de403cb5a395c82063de5f1bbb1481ec469a434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=naruto+final+mod+download PDF link annotation
    • http://jinruily.com/UploadFile/file/20210916045731463.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/12043292974.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/gibujenarodanuxibufowemix.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/93454603422.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/dipopotukorodafux.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/rikoserek.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/dosezarenumunofum.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/68478588795.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/puregogafojoxirogumose.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/tokekivifaxijajeron.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38795544896.pdfIn PDF document text
    • http://eva.am/files/96c7cf0b16d7c2da.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/r0v2830rlmsng33tt22n8525jj/16689320829.pdfIn PDF document text
    • https://bak.vn/upload/files/30283844761.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/7616437186.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/81821082890.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/72395924918.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210907220727.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b66f49eadd---84122735151.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/71689530600.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/76516812419.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ut354d4nuer70bs1lguq21ec2/naduwevojaxuvoxofopegaxu.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/vakedujib.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/panobizigenuvenugugajuvu.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/76355239546.pdfIn PDF document text
    • 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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 15640 bytes
SHA-256: a8f9f4f8ecfa73c4be0f25654ac0f6c4dfb726cbd1a8fdcc4660ec7fa84b07bb
font_01_sfnt_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 10376 bytes
SHA-256: bc8ab2d2259ba38b2303bee615746a8a7d0743281039a7a0024cb18b9627c2b6
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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