Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a0da6d04f9b3f2…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 19:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d7314fbed25d2e1d66bc48531a13c069 SHA-1: 7fb6a35bd7e0e014ce9c8d9777f7224f58bce74c SHA-256: 72a0da6d04f9b3f27fa51d0e7fff730af1049bf76686d33ee59311bd8169206e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to facilitate the download of further malicious payloads or to phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=combinational+circuits+and+sequential+circuits+pdf PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609375cce63aa---70183621176.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c21f7101533---xolalerepegaselojedir.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/90e3f35a9034db633a11a00e7d0cc42c/87260694858.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4692f522a110a911b10227b12437d978/numovebejapinamumutuvot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbbb581ea---81041603730.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/60889979733.pdfIn PDF document text
    • https://dintek.eu/uploads/file/26389101500.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/22880633177.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/mijuvemutofiravetozas.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mgfcref70irojm1gfueh1915i7/korujaxot.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4c88389b348079e0c0d9ac772aef7a6c/34337616906.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03287afe9---ginadosunuxelafubosisem.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6cdace0bbbe526ad95ea73af42a7d5c4/fategojivalizosarox.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/44539438380.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084909956abb---ripiked.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/mdboi76l8hcttf02f6svpiqac1/91692995241.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/nidefuwow.pdfIn PDF document text
    • http://poorclarescork.ie/images/60449087673.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/mexawev.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d9677509b---vanunatofogivimosutikeri.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4e11737e3---598392945.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda05755f4---26079986342.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/ea8e95379c03048156b991346eb8c4f5/36584357941.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 16912 bytes
SHA-256: 08403a87acb44e3bab86bd3807b2deeaad2712b992b28c3250f234c6c3e7a0a4
font_01_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299D 11200 bytes
SHA-256: c7dcd53fce6682b276f6e8d1c7e96dbf99c70dc83fbdb15fc59c883db387ebb5

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