Malicious PDF — malware analysis report

Static analysis result for SHA-256 c643fd26b54797cf…

MALICIOUS

PDF

70.0 KB Created: 2021-09-09 04:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98f0aa9d370fbaa673b2fd50714c4732 SHA-1: bcb40840050d15c5c78810bd41619b1dccdcfe51 SHA-256: c643fd26b54797cfd81a69db261a0756067e7c54bef9ddd2c5f7ae8478cac450
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=need+for+speed+most+apk PDF link annotation
    • http://novena99.com/uploads/files/202109041052586338.pdfIn PDF document text
    • https://andana.us/files/files/91910768755.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/lugewimalatodawaxenexo.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sunidanibinid.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/masewekibewejowatazi.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kunawab.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/71771057496.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5a124bab---jimijorunanamitemafat.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/ninetisosopowesaze.pdfIn PDF document text
    • http://prograsifkalip.com/files/loxuvuviripesiwekowifi.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/84297758291.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/98210240301.pdfIn PDF document text
    • http://master-br.ru/img/file/bapaxidezavumel.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/40948599416.pdfIn PDF document text
    • http://pronobile.com/catalog/file/41934383395.pdfIn PDF document text
    • http://nature-revive.org/files/file/17384004240.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/91b0dc87844839bf0138962ac3186451/18007852436.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/73040852004.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/58399994187.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/86134215393.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bkv8rb6i9obuungd7idp8c76e9/gudisavepomenewugen.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/gitokobika.pdfIn PDF document text
    • https://12shio4.com/contents/files/73994080578.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_off0000b2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 10488 bytes
SHA-256: e70720dcc7cdfe62cabfe75ac80c0957cab8f4ce58bc8bfb68728d8bc2036576
font_02_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 15652 bytes
SHA-256: e1be064b11653647ff5c1c34b57a156b8823b119b3e5a79e2ae5329a8a3729cf