Malicious PDF — malware analysis report

Static analysis result for SHA-256 1668fd22027c2ba7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 12:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bf6f00a04605b206c2f79dba1caad8f SHA-1: a1b55f6f484dd7d0d70a006dd3166e4c4b700dce SHA-256: 1668fd22027c2ba71cbde96b5a78339e289cc1d440be40fa0dcf2f0238f46f81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to disguise malicious links. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.donboscovizag.org/images/files/valajisarasadufav.pdf In PDF document text
    • https://gkia.org/kingkong/userfiles/files/55385059991.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/23669516682.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/tiwuxivewuga.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/faritemepi.pdfIn PDF document text
    • http://lucca.jpsoftware.sk/upload/files/wipedirojudetobijorovoxe.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13250288661.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630599382.pdfIn PDF document text
    • http://temple.mo/userfiles/file/77513293083.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/jozujiseliwosejibaziwow.pdfIn PDF document text
    • https://istanajp2.com/contents/files/89068118628.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/37589596130.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ab89ae9fe116d0dba6cac2c1e7e4d116/84702493892.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/39847811858.pdfIn PDF document text
    • https://eetravel.net/file/87740690673.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/94237785254.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bj6dn96tfj70urap9jv31km3dg/52310446215.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/vodawibo.pdfIn PDF document text
    • http://robedecreateur.com/img/files/99158700238.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433a7d8027---55613767192.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/xarawigokeburabejuxepep.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/62529949221.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/15215616900.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/witofuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=moj+app+video+download+apkPDF 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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 19136 bytes
SHA-256: aac0746d70427eee8f11697c2cb0f268ac44d6897480773d0d693be663da5538
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 10384 bytes
SHA-256: e4070996f8cfbd268898ea3f8d7a69b3ec0cb220bcd8edde90dee36c7df9aeb2

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