Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e71431f3fd7aef4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 00:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5ce9fe946937297472ea9027b85ebf09 SHA-1: 35e0969184dc35812ad49292105c29eb12e1abf7 SHA-256: 2e71431f3fd7aef491677dc8e8a23f0d9c6731f4711fe3a5ed4d236bcea62d38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a malicious PDF designed to redirect users to potentially harmful content.

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 http://ping-property.com/user_img/files/nemegixizuzokopiw.pdf In PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/80312254983.pdfIn PDF document text
    • http://net-work.cz/data/file/jumopivuxokosovol.pdfIn PDF document text
    • http://atek-ent.com/upload/file/79587333314.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210913040255_s4llm3.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/89900317907.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/88745088527.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/91331184918.pdfIn PDF document text
    • http://cpils.com/userfiles/file/zodide.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a043f67aad---wamafagojakidikone.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/famunanefe.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/voxibexazol.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be44f44040---fajovete.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4abb9aeb---zalozekasatozitogibuke.pdfIn PDF document text
    • http://sun-eko.eu/files/file/6070325282.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/be98725ce078bb8133b2d3a51766482c/4813327024.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/18626729880.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/20270203180.pdfIn PDF document text
    • http://storemisr.com/uploads/files/24740594135.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161425f014f24f---3538967509.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/85713883215.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/4233460369.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/48561128090.pdfIn PDF document text
    • http://kaies.net/upfiles/2109082245404437404yjc6l.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=anna+karenina+book+pdfPDF 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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10392 bytes
SHA-256: af6a899fa51bedaf06fb7f1f08008f8d996b03e29a1e8d590ef02e4a4ed5ec0b
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 17340 bytes
SHA-256: 3fe2219ea04dca90148a54044bbc45b3611a1a2fb56a8924ae1339079842ddef
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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