Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f61d9981c51a2a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 12:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6540ce172c0bc783944ba684ee515198 SHA-1: a93e8a497febd8f40578eacd2b0c8633501f7a84 SHA-256: 58f61d9981c51a2a7e8bd5ff9bd02d56aadf8d10b0bfac66718960e0da552c8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised domains, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bbc5c9cbcfea7eb96c8b9cb9c795cc86/zamivekopezivomukin.pdf In PDF document text
    • https://foundationkuzmanov.com/files/fezavinigizona.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/45010963889.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/mmignseuikkfsp3jptf46jb3l1/gezoxujopifil.pdfIn PDF document text
    • https://luminex.pl/upload/file/8229879102.pdfIn PDF document text
    • https://mbbs.hr/files/79246565362.pdfIn PDF document text
    • http://vucert.vn/uploads/files/24761444242.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/27275933218.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaed147654---58254887395.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/loxiloxer.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/41445571648.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/8675775955.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b4757048c1b37e092d2a82b0a4b3c863/98979404488.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/75860572978.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vavopiwofomu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613509d68fb76---jitazewiwukikafa.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/darug.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/29928527401.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210905_21EE4AE3124A7003.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/31009416540.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/pivunosewevotuvawozakow.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/5997525732.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/61376858750.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/gizilawenaden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=reading+mode+in+chrome+androidPDF 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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 10552 bytes
SHA-256: 765d3ef42c6d29a9470eb1001de463d2dcadeddbd6c58a4624e1fd7a762b8e3a
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 16992 bytes
SHA-256: b99305373003f44aa48b2446a3b7e1f1ac68357a38897b7bdc253ca9e3cdf773
font_02_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1