Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cabf143e8a4725…

MALICIOUS

PDF

85.9 KB Created: 2021-08-27 21:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ad1af71408ec49e7560402d869fb86a SHA-1: a25749e8745cecc3ebd546e6a8f5140ad0d93848 SHA-256: d4cabf143e8a4725de40b0ef55b358c8ed5292db646e831d22488e2277c8cd74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a pattern of hosting malicious content on numerous external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=acth+hormone+and+cortisol PDF link annotation
    • https://thuaphatlaihanoi.net/uploads/files/75179799048.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/zujesidukifudeko.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/jolus.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607507186ee9a---mirunejevekuwexabaji.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/42512554962.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606df30aef253---kiwapivowavikop.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad54ba7ae4f---32018827141.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103c741af79---87403042500.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/vagebojoxiwigutisilujar.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/66a445a0e0c4b8e4df1a7a8ef32e6719/wobajuxelujadoje.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/xoziwekabupefuzusaba.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/7816147793.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/saruvaxasusa.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db02f086ed---mimenijodude.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uftuuccd1c68vr2n5tlv4vqb60/vorelasokes.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210702054711.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/pdc1nut8tv4ofnfaggaquramd3/nazobezutagopozidabo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d8df272a0---73544472435.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/xebed.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65113df10---41424206623.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/mejowulosiwosaseledofod.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/24579365072.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fi2emc33kb3f2m1kfk199bad11/13749199326.pdfIn PDF document text
    • http://learningkey.org/userfiles/92724349785.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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 17404 bytes
SHA-256: 3b14a712376bd11bc5b0e261f5082d71494100e5c32fac5391072fc0e14f90ea
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 10616 bytes
SHA-256: 535da162441425abfef37abafb8e4865718243872a1426563ef51d97902d9dd5
font_02_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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