Malicious PDF — malware analysis report

Static analysis result for SHA-256 278d4d8760795a4d…

MALICIOUS

PDF

104.7 KB Created: 2021-07-30 18:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 90b581a1d81b823f04c48ceed06b072b SHA-1: 53257aa9acb12e04a7dfd29b7c0a4a9990fdbfa8 SHA-256: 278d4d8760795a4d7d5a1dc7cf66157818e9a79557dbab34ba7760b94f2590bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160774c8dd313d---89844797248.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4de42f34a3---mezeg.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4974818750---tumoseweza.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607651c656f5c---52092212278.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b1f67078a---92570120964.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/51793353663.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7478ab9c---kikujofagudujojizadavava.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/43765212553.pdfIn PDF document text
    • https://citytrafik.nu/images/file/99950971088.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/86219566713.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075617e82c7d---97938875082.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/zituguvedarefuzajuwe.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160febacd995dc---jumoleguvut.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/83864746654.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ba0154358a11eb1e4e902741edb6cefb/petasetovuleluvoguludo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/24621816067.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/99501015767.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/33190888188.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e793b99d5d---72596915396.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/gutiwusafe.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8226ea0b8---78000046644.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/sofolusunarawufejazovoxam.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/609feaafa5743511668fddbc2388aae6/teroxanuwijawuwugoxikiwol.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/51d188243a2cc573396c5f859ed9739d/nazesojiwiraxas.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rmspt2ut1883k0at60fflmsjgr/jekusekekikigilogimeg.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf52d585b37---zolibafeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=arduino+ultrasonic+sensor+project+codePDF 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_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 10716 bytes
SHA-256: 12e77639f3de68bf7d158b7aba50b8a0bfb96794773611b33cfaf6fea936aa3e
font_01_sfnt_off00014bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BD 18016 bytes
SHA-256: 799ebe49293cb244947fdbf4012a773d6008244cb59450bd76f885d9cd44d041

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