Malicious PDF — malware analysis report

Static analysis result for SHA-256 636f4314fb035d91…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 07:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2092a40b09e7f70d332cdfcf8a83133e SHA-1: e5cadf48b302e6ea863521048e64fff887984e0e SHA-256: 636f4314fb035d910b4fadc106ac4bdf06a54a28f5aec9857d5df8c226d14dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to link farms hosted on compromised CMS upload directories. These link farms likely serve as a mechanism to obscure the ultimate destination of the malicious payload, potentially leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077a3bbbd77d---fepugiku.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2a014449---10692830322.pdfIn PDF document text
    • http://momsystem.ru/public/file/16477440583.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lamukufudosebepipuzidaj.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/86420331009.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6ogoncstfvph6tuf7ui9h3sq6v/gibunanepejefuvuwo.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/61805235352.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/95314112684.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/jojalebajen.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da90f6968c1---18269280882.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160735dc402010---76233877377.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a88dd0dbc---54161577244.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/36651788909.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088457f6d72a---xufuw.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9ee6ca54f703658ebb3dd845bb6e4584/setiriwolowozexatasitomed.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/getux.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8c917afc5---81397784472.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/39805481445.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/9690a4b133f92453f8f6ba4eef961480/30396156024.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3e7425834---zenujezupitasizuxe.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03bcea3274---nivesigozazomurizakezof.pdfIn PDF document text
    • https://izr.fr/files/rawekorumekuzoka.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/beb86242a0d61503aeacae9b21033d32/fevenoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+finite+element+method+logan+pdfPDF 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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 10948 bytes
SHA-256: ed6244dee3558713ddca4b34ab0ca8fa21ab99cf1483b08f53ae84f0be1bacce
font_01_sfnt_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 19176 bytes
SHA-256: e234d7f8ba3203fd06aa2a9d3ddd49c0459013a0b568f4315bfeb1c76fb30e29
font_02_sfnt_off00013006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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