Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd1282dc2d778a5…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 13:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c07a0e5e005e81d8a2a43cf5f138f0ac SHA-1: 0aa9623072a546ec91e77afc05a7c2fbcf21c730 SHA-256: 8cd1282dc2d778a5ec6a4620faf620e9dff5a22c23a0b78a7c5c30dc01e1ad8b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress installations and disposable hosting. This structure strongly suggests a link farm designed to lure users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crewmak.ru/uplcv?utm_term=linear+component+analysis PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160afa92354800---77254508549.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/11635955672.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8db1bee091---xipijodadara.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/47d26db9a00a91c709b81007d6c1fe7d/jikifekorutijuzalojus.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ae167f7e---16091734552.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/vegam.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/6470190475.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/71781263919.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161173a9d4bd05---77612891111.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/katoze.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/09853440fb8c66c20c818c325f22ba92/70075825932.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/45565508646.pdfIn PDF document text
    • http://sdds.be/userfiles/file/58547634923.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609779f6b32f7---zugagaxunosebubavok.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073260c6a572---51567295251.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbb35af64---divaroruworaso.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/4ada6ecc3bd794de618bc3a4cd95e8c3/40558009241.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/dapavijitugavixal.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acbed684a5c---16995080654.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/55432469783.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/68397068024.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ribae2c103gdaaro6rk80bhtc6/dopofeda.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b21f4abf978741341d6c792f18a83960/79622054079.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/pafejazawetogubu.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_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 10608 bytes
SHA-256: b6011590bc66226c089883991f1e8cf83ae25961d7189389ed93b84d7005c2f3
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 18100 bytes
SHA-256: 3dd8ed3976f6a1cccf1c503ed8f40bf0c39f9d912379da680ae7ae3995fd6ff8

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