Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b95662d4ed072c…

MALICIOUS

PDF

83.1 KB Created: 2021-08-31 19:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30a133cb75ca324a953ec29f0f348ca9 SHA-1: f00d6ae722d4d4da90fe46e5e8ad3ec958ae3725 SHA-256: 75b95662d4ed072c1de166c7b579de144f5ff52655bfa9087e8fb2310aed5c5c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and link farm nature suggest it's designed to exploit search engine optimization or user trust by appearing on seemingly legitimate but compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soudurelauziere.com/upload/editor/file/43361337757.pdf In PDF document text
    • http://sevoir.hu/uploads/file/kaxamatexuwomiga.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/30a98ae8eee45baeb99f1d8581068ded/gawufezetadonabufotubojal.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/476c0cb6f08e27b9126c36762aa638d9/44208895228.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/22622232401.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/felilirodakurerezibunab.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/fujojosigiruniretu.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/73820872723.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/22538478111.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/nozogibexemedizikaberez.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/nefanebesexaziwid.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/zejokewasanowebuzufod.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/wutagilatogiwadajoged.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/23210440650.pdfIn PDF document text
    • http://friulanapanini.com/images/file/47189722621.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210628215307.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/72636767169.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/78586fee68393a7c74bb988d3b031a4b/81030048244.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/4246479921.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210626142251_0z8oto.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106260332.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/vimebomafezokawulikezek.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a24794e263d01f90b2b2f07f7795cef5/15237716820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+sea+and+the+bellsPDF 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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 10136 bytes
SHA-256: addf924e6f16e9f70769bedde104a3859574616eff035128dc94fb0ee293cf40
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 18308 bytes
SHA-256: b9984ad0cc7e94a27ea6a724d51eba9f72e93c8412e29975a1d5ad4168b3a193
font_02_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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