Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b578c4f12962e0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-22 20:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8dd7662543cb20e4df9537cfa99adaa5 SHA-1: 01496838e7e8ac574cbcaab8e68372056e21c70b SHA-256: b0b578c4f12962e0a623d749203880d010d85a6d43ab4a698ef9ce5db5aaeb73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=what+is+json+parsing+in+android PDF link annotation
    • https://andana.us/files/files/74964590960.pdfIn PDF document text
    • https://subded.org/userfiles/file/wotefivazi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9dc2694ab6f437c36931632aac3feda4/tapozogokeni.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/lolonalokad.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210903215235_kmhig4.pdfIn PDF document text
    • https://heyratacademy.ir/file/kumos.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/96089360699.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/demakepudajof.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/88651497459.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/wukojipuf.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/xesarilewivanezibekifaji.pdfIn PDF document text
    • http://aven.su/userfiles/file/34922477887.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/16666327657.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/79e29c56bf585d2866c6ee62080e5b54/96857538479.pdfIn PDF document text
    • http://school15-tyumen.ru/f/bodevaweba.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/5117820849.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/wiwan.pdfIn PDF document text
    • https://micsys.in/userfiles/file/98337518931.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/48285634059.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/18287076160.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/gidiwajukafekesi.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/85527745873.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f83b243c53c53e7960da16308c839659/77247662953.pdfIn PDF document text
    • http://web5gstore.com/Files/files/nejezitejabowuweruwab.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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 10616 bytes
SHA-256: c86f725629059f3d5da3a228d49175360e22be5db9031db1a418e0e6748a73ff
font_01_sfnt_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 17380 bytes
SHA-256: 139f0107848d45af361cfb64ec7bc28398c1a611d4b7a22cb40ab7c008b98b0c
font_02_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1