Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcf943c32573278…

MALICIOUS

PDF

68.9 KB Created: 2021-09-17 18:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96a001a8cd70383862e8c07808d4a594 SHA-1: da60151659e1e34ca47a525e6d825e97dedeabee SHA-256: 4bcf943c32573278daf47f2881194671d6453a4ebfa6acf6f976d57718b8363a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=raid+the+dungeon+mod+apk PDF link annotation
    • https://mintedimages.com/ckfinder/userfiles/files/jowijenujakagom.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/topuzeses.pdfIn PDF document text
    • https://people11people.com/uploads/File/gemefewibinepo.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109111201121325.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/cqvvn257pkv198bif90a42v64a/gadomukagizupijezot.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1b804315846a68e20a20e3adef4dcec8/10692211395.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/witipubavisanuvoxa.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/53864682177.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/wemonol.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944cea1d17---16749359621.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lesavibijewobazadiv.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/girejabigefu.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/71242138626.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/16543430206.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/48148709596.pdfIn PDF document text
    • http://dd-eng.com/files/files/38839728424.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/51619923617.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/siramaxumukek.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f74d5536e3d69c7cca1f679a5ea7227b/92614681893.pdfIn PDF document text
    • http://skupka23.ru/upload/m/gexuwaxenivuxakavusi.pdfIn PDF document text
    • https://zzhqhi.com/d/files/98844511558.pdfIn PDF document text
    • http://goref.ru/files/file/todofoneduvizemenabine.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/fabuzumatugamubopi.pdfIn PDF document text
    • http://atomleasing.ru/media/File/golabosenapowube.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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 15668 bytes
SHA-256: 297a6228972addbd9091bf00c7dec54bbdc880bb4d8f22379c522b4b5d58561d
font_01_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 10764 bytes
SHA-256: b14ea04a35ad3bfdab09311c9cecaaf6fecca408e00ac68f1e5973ab8dd7caa3
font_02_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1