Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcd44f8a4445dda…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 09:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6a56f6164f2dfbbb4008e2a4eff226f SHA-1: 1e815385bb5fc47da183f09031293e8ed0e3a1dd SHA-256: bbcd44f8a4445ddac2c71d076c4b39dd3d084f0425b655063e75bc80f53033d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting, indicating an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://synerhu.ru/uplcv?utm_term=cool+android+apps+2021 PDF link annotation
    • http://mertcelikkapi.com/userfiles/file/72634889836.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/mekibowin.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/92409086482.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/rubunasawaponevibojan.pdfIn PDF document text
    • http://a899.net/userfiles/file/jurinujazab.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1be8d874cef2a75f83531a6bb00ca11c/88985311467.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/76233222061.pdfIn PDF document text
    • http://www.pilartangguh.com/file/lamaku.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/matuvinexevebokakakamom.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/butamuraneninalibamofusom.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb01605bfd---togaduro.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/53085627612.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/vifipo.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/vitolexagivezovunogo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161370873cc954---febagusibudu.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/64600098242.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/zatumadaxekizubofem.pdfIn PDF document text
    • https://binhvi.com/upload/files/33989597189.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/wupafokox.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/fimirafuforazi.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/widelabobizorasemamoza.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/711b8a6a9c4bda684248055d709e913b/pebak.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/sininododuwodarodujim.pdfIn PDF document text
    • https://korankertas.com/contents/files/tuvodup.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/zawalaxukot.pdfIn PDF document text
    • 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_off0000bfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCE 10480 bytes
SHA-256: 6e37d3c0a2f912a386704da1b7c89c7da6496016f9386a6fb5eefc63213021cc
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 16596 bytes
SHA-256: 2f077d8ebb1378f91af863b1092a956b97f4df71fd94993badc4d70823a70cbe

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