Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a14a82bdbb147d4…

MALICIOUS

PDF

95.1 KB Created: 2021-06-26 07:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91851496bb882c72fa7f0a375e59b6f8 SHA-1: ec52296580cbe03ec4bd94941d01c102df38365d SHA-256: 4a14a82bdbb147d4b0ddf105e0f24d9f2586dfc0955dc53a3fcc65330a4b44c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e497724184---gobufi.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/442rdcmiuum9kgrnldg8nmhdb7/sofedugolutubopejonele.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af419c5971c---38327887232.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bcfdcc9ae8ceba6d338205761021a9af/ladinorilukaxopusuv.pdfIn PDF document text
    • https://fishuntpesca.it/file/tebodavuzo.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0f6d7772---58792306537.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb7f585145---validow.pdfIn PDF document text
    • https://t2sc.me/userfiles/4943787392.pdfIn PDF document text
    • http://short-story.ru/upload/file/11300437584.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/89353775444.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5679bdd2e---71975409983.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/fuzove.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ec84c53e---58631620971.pdfIn PDF document text
    • http://candientushinko.com/images/file/8671449113.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/jesiz.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/07ebb17d88044a72b499d2385db4af3a/vufatuwulipoleziki.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/98595415919.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf2241fba---bekos.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/64287511634.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/paxufibetivix.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4qd0a7pukspcggi4lshhc4jt2m/luvalewesesaremamiw.pdfIn PDF document text
    • https://deepex.hu/hirek/files/63263212267.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4569e103ea---susedunezonuwizoguziwewe.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/64998285003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=japanese+rose+tattoo+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 3444 bytes
SHA-256: b69cddb7e7e21bc1b2a9b07da3ec16864ed150caa99890a1d28a2d8e3589cfbf
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 17148 bytes
SHA-256: d56bf0384da168909d59461fcf6edcef97b0d2945291c4b8acaa14a5bd9c80fe
font_03_sfnt_off000156d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D0 10540 bytes
SHA-256: de51f78ca1f9cf7f40ccb278d60b8255a4dd043bf68fca77ab675b308877b0f5

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