Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6baf9e70f93a32…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 05:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 331564341e25dfa042a1a35eb7de65cb SHA-1: 235f6fef91a18f0c7c5b2f6852d2ea03efde1231 SHA-256: 3a6baf9e70f93a32b967f993636efd5a4a03da709104773683b723ea818160d5
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 are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=como+conectar+android+a+pc+por+wifi
    • http://xszhuhai.com/uploadfiles/files/vemigemefosekimisotira.pdf
    • https://planet-pvc.com/upload/files/vetezatawasirub.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/sogugoxebukodiri.pdf
    • http://ziva-muzika.cz/files/file/49173008977.pdf
    • https://valgott.com/images/userfiles/file/ralutiro.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9955bb725440e7b7690413e3ec49a950/wozawoj.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/poworajefasofafo.pdf
    • https://bliznacite.com/files/figeboreret.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161334850c21e3---56045940193.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614915303e16e---86009111516.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/furumasezibezowoturus.pdf
    • http://benrassam.com/uploads/files/dokeborolufipewaxetapi.pdf
    • https://taxfirma.com/userfiles/file/96929005633.pdf
    • http://lamorenj.com/userfiles/file/kurire.pdf
    • http://bagiez.de/userfiles/file/80729161190.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/fuvujulinava.pdf
    • http://megatex-plast.ru/pub/file/lalebawaxozogetin.pdf
    • https://adoz.cz/ckfinder/userfiles/files/sepevogerusidetewex.pdf
    • http://hengtongblower.com/d/files/xitotuxowiv.pdf
    • http://rem-proekt.com/f/file/35528291858.pdf
    • https://faceless.me/userfiles/files/binofovaviduz.pdf
    • http://neodentpetrosino.it/userfiles/files/24131889460.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210909_AADCEEA218164F8F.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/47980217645.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_off0000d6b6.bin
41bfc18c9501afa8e8940a136f02561e9d04a34ce7d5491fc1ac13c3a9992168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 17492 bytes
font_01_sfnt_off0001037f.bin
4cc60870c3ccb9639daf26bba256afaedce9b5777bb81cec6698c5ff1736dd60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 10684 bytes
font_02_sfnt_off00011c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.