Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb353184b431e3c6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 05:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c431d9ee2244e4147390d8631571cffa SHA-1: bd12a933bf5a05be5860d2ea2a0ee0a26b4d0d70 SHA-256: bb353184b431e3c628d11dc30f9550a354e56527b6ad1e24e3f1e837506d214d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely serves as a lure to redirect users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=red+bug+with+white+spots PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bb4191fd9---popagijoleluleneperije.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/jokizedesozefipora.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/nakemovol.pdfIn PDF document text
    • http://retailcop.ca/files/22397607462.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c64698ee091---zekononinepiwuxef.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/34000128817.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/a4eocoo410rhk6rgvj69p7ds1b/jibukokibegor.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd05090fb83---63221327105.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/88513490092.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/69707050184.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/keribinovi.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/benod.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a051be5c5f0---zagividebiw.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/65778735839.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/79175105431.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/kdta1mb24bj9qo88u3ku69l1jb/pabimemapunobozafejoz.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608792a9817a1---4487148304.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/lulebubajemetutaseribiz.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///13870767858.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc6dcdda6---nipizuwagaxo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/24ec0a2f2beaff3ba9b177ad006387c3/98686959065.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/dibotokogiwatakupud.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/zamip.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96181d0e23---89346952387.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_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 19976 bytes
SHA-256: 78145c229726b1e7753327a26ffb569c807d7681ad932b42c24511cfda4e8f37
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 10628 bytes
SHA-256: 7aa11420e75886177271322993c90cbb8266fc7b5de08aba11ae58d9fb840e8a
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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