Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01155d3341e8edf…

MALICIOUS

PDF

79.5 KB Created: 2021-08-29 08:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 17b565a4f6b65c11092cafa2e502e3e8 SHA-1: d1b6355d7bc18817bb656ad6c9064073118f63a0 SHA-256: d01155d3341e8edf04e6dd7fd96cf0492df82644a910e92b05b2bc66551f6fa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the heuristic firings point towards an attempt to lure users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=daycare+tax+deduction PDF link annotation
    • https://aep-tc.com/cache/fck_files/file/jowopetovekufuposumi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/jm1apceu9180a1jmp3pvjd0sro/remibuz.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/nosenosemo.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/dovilunizagibifevaga.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d7ee93e13---gamofufogodimolinonovipor.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/73cf30964870b72beabf8d9f91353277/24624504945.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/77c42na7gekn2anb6m4llsnnk7/48043282561.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/davesaro.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/digiborameviwagamenup.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jogizirekejaf.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/nobijozifirukijuzoti.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/jokolegali.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e055cf3ce1ac5c45be9f32ec6df0ff72/foborukujemuzevu.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/34257885080.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-26/2108260059221879499igtyxtmf3e2.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/kaxebatadolejufeno.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f1e295a33e64d1eacb7b48681b3ba5a9/sizitezufuraputujorif.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e3e1427f6---23942201064.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/3062255584.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19cd7144c8---vofipomotoxikuledudesofeg.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/414357e2e5178bf4d4605ed9a5fd7cd8/fuzexavagasowo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/avr734e6hsm6fu5rij8bj24fbs/jobemuzibevewogetovalegom.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080317bb3627---42106467754.pdfIn PDF document text
    • http://standdominica.org/files/files/wemorekabupesonevik.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/76359033843.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_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 10464 bytes
SHA-256: ca83ddab561746bce54b1fd6e780175249fd2666ca92e62af135682a01489f60
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 16212 bytes
SHA-256: c7fc2c87e5f8602aaa6dedfe5c1f8789fda0f3acbf6bba8c4db51631093d6491
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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