Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a767e840c17540…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 04:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f60ce848e6ca6b5bf04e18b5ec65ea39 SHA-1: 25d03ded4d71828feb6d7e14e4751146b22a86f6 SHA-256: 74a767e840c1754022179ad3f8107aac4d463eff922dc72915ae28165fd93088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded artifacts are consistent with malware delivery, likely via spearphishing attachment, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=instrumenta%C3%A7%C3%A3o+cirurgica+cesarea+pdf PDF link annotation
    • http://niktid.ru/userfiles/file/34066746991.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160843989df946---73642062318.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-11/20210811055208161197.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/85549124299.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60286568c---71884886485.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/18948033246.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/kezatel.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/84887116810.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd65a246c6---zonowulofoma.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f7f9c53f58dd7a72c133cd9c7307873e/21455912000.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/xafavepuvur.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/fikesetowajerevi.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/nojezulonuxisi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dad6a9dcf---32072343883.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/0cb76f4ef1e933bcb807ee82c121f9eb/29487981090.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hbnte8k8i48sjfucr34dvi9fvv/luxaminafefuliwadaxa.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/zisisor.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/soxajizekejugawo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c7e1961c7---kefapazewopenesupixevofit.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/rokutoxobolafezekuve.pdfIn PDF document text
    • http://fructusartis.com/i/File/bopapilinewoxivudo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 19484 bytes
SHA-256: ad5f40764d6866371b8a7b98895829b9a6a93274253aef5c0dfaba0a3696963e
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 11432 bytes
SHA-256: 56102a829a2533142fab60fc6c487593eafdf5fc18c913eee2d6bc8f56add8ff
font_02_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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