Malicious PDF — malware analysis report

Static analysis result for SHA-256 c642d1d5c3277a20…

MALICIOUS

PDF

69.9 KB Created: 2021-09-07 11:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86ffd807657512b2d0a99a5c8f475a8b SHA-1: 3a88a3be489f5eefc62a69daefe71828aa47e1c5 SHA-256: c642d1d5c3277a201e5c4c4e535d6aed062c669a0209843f1e09f726e9ba92ac
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://phuquytravel.com/nguyenvanlinh/files/26198542425.pdf In PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/7d87e886f365d51189db8eb23d6724c8/bodilepujipasepigaloseri.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/ravaf.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/91841160572.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/c8ee77ce80cba818e5f0d305bbf35a2a/mukolewikepudalemun.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/34346380378.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/nupugamabubuxipim.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/149fab4365122ebb37e3cd5df698b2f8/xigudavibuwilusugenom.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16123613b531ac---51421983972.pdfIn PDF document text
    • http://4darchitecture.org/img/all/wivepud.pdfIn PDF document text
    • https://keongracun.org/contents//files/dugevavako.pdfIn PDF document text
    • http://billsky.ee/files/file/tipekunejagagiwawazaf.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/27861917736.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kakitubeto.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/52afbab68e9afb7b03fa13b111125dbb/31869436314.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/270672721.pdfIn PDF document text
    • http://kasargod.net/uploads/file/rodisajoxuxapamitixirom.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pikudunosilosedaloda.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608908a84c047---xawisovivovurovodifelizam.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/wajodaseloguniro.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/567a8b02e4a876e3315cad88ab2d3723/32592742459.pdfIn PDF document text
    • http://gptools.net/userfiles/file/63158611130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=coombs+directo+e+indirecto+pdfPDF link annotation
    • 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_off0000b4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A2 10744 bytes
SHA-256: 6c6ef2b6fdfdebd827faef7538f77cf4fe228cc898b777e938ce35a7546174a6
font_01_sfnt_off0000cd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD19 14664 bytes
SHA-256: ec972cd1218106589b45da00869901d45f43ea71f583c830f19ad112b426fd6b
font_02_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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