Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57ddc7073ce199c…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 16:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7b544d69ec7d4e6a37bed63978b6065 SHA-1: a67de19d412003530c33d024a42d10ebed0d232e SHA-256: f57ddc7073ce199c70ed0c99c311e5bc857153dc97456136df8ae9f111b5cff7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links that point to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://tencanpowder.com/d/files/87990253554.pdf
    • http://adance0112.com/upfile/editor/file/54037100822.pdf
    • http://market-oborudovanie.ru/upload/file/dukisitotugosegox.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/80582838481.pdf
    • https://proxus.nl/file/58853792188.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/025031a91dd990c7fb773067caa0092a/mulut.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c59669935c2---ripemalurafezepunu.pdf
    • http://esipro.fr/userfiles/file/16434896254.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087fea6256ba---vobowafotovulep.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7cc3c0bf5---46175443693.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4d08e6e82---vezetivememazavegumetatek.pdf
    • https://uclerbaklava.com/resources/file/7784097939.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b4040d0d---verufine.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/04dc166a39eabe66a0e437902ff97a22/tijanogavuje.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/71f945530dbd0362ce09ad3418926b20/74313861152.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3af6c9a77f---pisigogijeti.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/027978c4aed6279070ce122e63a195ff/86262447820.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6a4509e7---96479266437.pdf
    • http://aplus.to/userfiles/file/maxakurudokikoxosaf.pdf
    • http://alexlunacoach.com/img/editor/file/95555972506.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=advanced+science+letters
    • 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_off0000eb1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 16792 bytes
font_01_sfnt_off00010334.bin
037075dee2fe83e9663420af6983acfdab17b193960b1b6031b53b3299baf181
pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 10292 bytes
font_02_sfnt_off00011a82.bin
c3c73629d529bd336700bf4492ed0f218f7cb7b08a5f6567b41f9b3078b33773
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 17524 bytes