Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f4dd299de7b9fe…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 15:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02d319d4bc1c1ab9c1b2dcb3e163d49b SHA-1: 2b9a0bfbbae8c49d72976994b54d8844a780b912 SHA-256: b1f4dd299de7b9fed946b223d88f05396ad8fd175c6ca062288b33c955dc6c5a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=mazda+demio+2008+workshop+manual PDF link annotation
    • https://crownprolaw.cn/userfiles/Proj_Name//files/wivuturedigotoxu.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/61144251356.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/76301159106.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/ximagawabavitafimarab.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/8214929796.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nq7bk7f51fo1i67dqtamhncl53/wipero.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6e7karltptqfpemm9sgu89af9j/94123612735.pdfIn PDF document text
    • http://fedime.org/imagenes/guvebof.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/larawoludo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mivejokazuwapilota.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160729f177607d---fasurota.pdfIn PDF document text
    • http://devison-matras.com/upload/file/xokupavedepi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wewofowiladovuxumuxa.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/55990880372.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1da8375a---90954669886.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/tovorubonaguviritidena.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f221df6f46b---kexijadus.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430195614414620.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9cb1a847---zonusinapegomo.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/56238506371.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/59583269537.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c13cf0425a3ec96f59b24a584f14c421/sevekakiwegu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/pokemubi.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202186857288017.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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 19548 bytes
SHA-256: e4459de92131443fdb187cf4c17b4053e3fcb2b291715febfdacf92d27681e68
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 11340 bytes
SHA-256: 84774da16e511ca7ac1a0c8a9aebee04dce9f7f46a994c788cdbeea749fadbbd
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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