Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec70443b89d305d…

MALICIOUS

PDF

75.4 KB Created: 2021-08-13 22:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3bf56b567c400b71c86ffbd57f0d8cd0 SHA-1: e121cfbe6c56d4ccc19bddd21715e0090fc9582d SHA-256: 8ec70443b89d305d426480f346ef4dea939a4baa91834b24853402ce5727cbb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to what appear to be compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further payloads or engage in phishing. The presence of multiple links to external resources suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/636214d0d7c9d54183bb2e10aae71abb/99160556272.pdf In PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/58105838877.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/64741528485.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/93484761545.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/77949175893.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jozuzakitilujumusisez.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866fe2fd49---81043964761.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/sekivimijikumolesowaja.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/1059006822.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf9b9d91f---78066039305.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/38093736118.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/subajoz.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/bisozovawupilovov.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/12971356617.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161043dcb61439---6340942042.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/nudazozodigasaxewobepev.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8009ek4m97q1iijfmv4bqf7nud/kujeluligebizoxusajetoren.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/29264333355.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4154d63f98db3d6f766cccc601762985/49271215589.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5649118e6cb7560264efc60601e563b0/36642097762.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kotekosigaxisabajizi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/qsuqbkfjfpaefr948tt2m6l9f2/34405825163.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0gjk5nrbqcdoq1jmuvtf5rerk4/mebon.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wigekuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=una+mente+indomable+pelicula+online+latinoPDF 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_off0000c386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 10656 bytes
SHA-256: 3e4011d8201bd456912fe432d4100db3d738f06d01dc518876ddadd8c0bef858
font_02_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 17524 bytes
SHA-256: d632539a1f301b41fba76d4bc5b504f75c1f58784d72e0fbef7fb53c1a467c6d