Malicious PDF — malware analysis report

Static analysis result for SHA-256 613b70054c7ffacd…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 09:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34975dc78648275aee71e96071aae04a SHA-1: 0c3ee69b7f83f8736dfaae4987d668f3c8c1ad60 SHA-256: 613b70054c7ffacdd176f03b957ec7a5a41d91ac80890a8ee7c6262001da64c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript is likely used to execute malicious actions or redirect the user, while the link farm serves to obscure the ultimate destination, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://careersourcechipola.com/files/public/buwozusavogelaze.pdf In PDF document text
    • http://synphabase.ch/upload/file/jezajugitefokujela.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/zisujupi.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/73663096502.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/betuvopejitanuxeka.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/nukozajupukeman.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/nadelerojipimem.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/71750972412.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/76442608670.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/58624603193.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/sijefokiwizanaso.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd70df157---60555233584.pdfIn PDF document text
    • http://melvin.cz/data/57281097666.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146988ba1068---18962855025.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6aaa3e9b7---femupefinemewot.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b0656b88---91856447550.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161420d5232e3e---73867267770.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/12527623721.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/81654330067.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/larawitikelokoxi.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/63311802145.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/bofiko.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/57456808616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=earphones+not+working+on+androidPDF 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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 17272 bytes
SHA-256: af9ce8c65113e8a27e6dedc74cb6d2e376069fc36ed81a396a1a969937350ce5
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 10784 bytes
SHA-256: f03f5460de62c06bcf5721a55024ab4f03b91858af496be8b6669011b0e5a0cd
font_02_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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