Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7bfdc600a8d16f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 11:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f20b968c100eec202b645dfbba4850c0 SHA-1: 52cf11f23be7c102fd53ce5666a44ad1aebed3da SHA-256: cd7bfdc600a8d16f61794bd591f8f990c86fec4abed40697c4e58881bb1933df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, likely serving as lures for users to click and potentially download further payloads or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=ielts+reading+practice+test+pdf+idp PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f518dc5dbd---89484846068.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210716063837_3tojwk.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161366d8dbd338---furavesepubew.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/68350106697.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b806604a7b3---26212901699.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/78442485376.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168006302f5---kirebalinupimukematogu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b569ea77116---73051029899.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/kotewolubanodubo.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/weriburer.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/88187823015.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210619035928.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106010800388888.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d6576d26d6b89303f1555b445a62ead3/22088891685.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/mitibidefunerudorega.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a07ee7fd---38397439280.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/rasalaxedujefatidasej.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608120da1ed42---wakerurufe.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/95628463261.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/61152996802.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17096487350.pdfIn PDF document text
    • http://platcometals.com/images/file/21613651228.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1981cf95eb11fe47e174f8ff545062bd/fatete.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/6260305897.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f8ae44118---14738617145.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/xiximesikejosewepube.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 16992 bytes
SHA-256: 22334284d0c369ec603d99dc73a70ff8a2ccf690bb0fd2e6433b90259d6f3583
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 10628 bytes
SHA-256: 2fdbd9ce76a920292e0f8a2235bcfd5b6a948c829d089f5accf684cc010e1910
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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