Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dac42b009697064…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 21:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9878099242c42fcd124a1bcb7336e726 SHA-1: a352e39d170c2af1b7e0519a2e80226e9ae19e97 SHA-256: 8dac42b009697064bc43d9acec77d852d17e14ce2069a5eb0d914e24a4bde022
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages. The document body is unreadable, but the heuristics indicate a malicious intent to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=physical+education+book+class+11+pdf PDF link annotation
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/woruditeludivikeka.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/11583873946.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a9f1fc76---3656067865.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/o639379c4os4qp40hh04njot2k/punilujodaximaganadaxanuz.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ibc1kh56go716aur9lhcbbqsae/55396294445.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/vugezaroxuv.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160daf6a12076f---wovivupojofatefu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7836eb91a---11478885794.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7971728880.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0897f1a89a---2814470635.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/13d8e6bbf95b038afebf04ef4cea9594/dujolebopesikiniguwejegi.pdfIn PDF document text
    • http://www.celso.org/download/bajiwidalegeletigonalewa.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210708062416.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/bujerofegivijo.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/4032102142.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/xugaleguwatolinatep.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083ced73f30c---43401601161.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607872cf186af---visaxodez.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160903db8ee95b---78091508123.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/dugexagoxonavol.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/napijunu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/111162402.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_off0000c3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 11116 bytes
SHA-256: 0450026f5b7e0066e09f65d73709116375e0caa5f43803b46be39626c707fa28
font_02_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 19504 bytes
SHA-256: b29d7019a52deda692d3eb6644e6a832e15da400c79361e679d785b7b9f6b041

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