Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4ac368bef8b5b5…

MALICIOUS

PDF

84.9 KB Created: 2021-07-17 00:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fdb153477eaa35f3024ea1bd060d5ec7 SHA-1: 4f3eed827f631682c89ae52a8c80db7e80e62b56 SHA-256: 8c4ac368bef8b5b5dcabe63073ed9e521fdd5814b5fbd6d320dd7d825e6c057d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and the use of compromised CMS upload storage suggest an attempt to distribute further malicious content, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://prtl.pl/userfiles/file/fewavu.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/55gl7vu31pngvte0ubkn6qqtvo/minizisupa.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780412d6907---70815495277.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/18cc5fa930684c61b481c50dcc0ae753/kisugufulifomipavegumufor.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f160baa2b---41380223714.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d283af6a8---rogisolufoput.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/97401249776.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a9669b14bd9---geriwubir.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de412b910f7---joxudavonuzozuliva.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b7776ca2---99550580865.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/649a8abf7ec3bdd5da5c794d208db62b/97807459046.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b305df1ba---sebuwapefoz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/83ffb12b1b17b9aaaf352f9c02b88ed4/15533632764.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/fefivotedubezigijinulevol.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f1cff414a6e---zozuleguzevakaz.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b3a744df2ffd0ac9f5699f87d2a221b8/gedesaxazitidogatixi.pdfIn PDF document text
    • https://coluer.ir/documents/file/29880486313.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/2970300204.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/39280318495.pdfIn PDF document text
    • https://termofriz.rs//files/43768875837.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0a74336c---22359975921.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0302cb01f2394133d5bc3ebffe9ba4d5/jodoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=resignation+letter+from+a+groupPDF link annotation
    • 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_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16780 bytes
SHA-256: 7f057b75120bb06cfbb5309eda3ffaddd28e384a37adf5403937e83b1e49f63f
font_01_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 10844 bytes
SHA-256: d0086b6393802da936e67321c2ee05c722fbbc5bbf8bd401324eb89646b8e46e

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