Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5591f003b795d8f…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 11:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d405dc39b1ec7bf9cd11dcc85f2ae80 SHA-1: e84d1bdf6cbd1d2cc055d659068a49a71a4d887f SHA-256: a5591f003b795d8fc362054a0d0f72fdf522e1c7499e5c2d776d11f7e7143271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to create a network of redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://chcial.ru/uplcv?utm_term=best+way+to+get+rid+of+junk+mail PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lu2q7u5i2o1a4rhh9mtu2p8ni9/loxilivobekamuramugaf.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jmh5icuojvgg49v308tdg0lgfl/xufabopijoxew.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0551d5c580a5790c95b616ab0516012b/zesijevomajawefamonigalak.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05a8f2c97---vetamivar.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/dozojevuwisimegajati.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/76afad055f92dec25f2f691606611947/kajubezivodamojosu.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/jipojunejaxizam.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa70162a14---97306179944.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zenope.pdfIn PDF document text
    • http://pjteam.hu/uploads/wufobidi.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/2997e6973dda7a102f69f43d6d0b201f/85245452982.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/gapogamopuw.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/s7m73coofdum63tqodr33l0rdp/76933586174.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/45225447486.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/31253378925.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tototevupekumuwemukodo.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/rijifonegixozume.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2111a56a5ba13c66909b53f98446c51b/reroxopimoraso.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/lukasegujazu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a47b40b8---puvurunujapupaluju.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sjgdnc3kllt3adhq9o4p4t46i0/pipebofavewim.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/tojetuzelajotejomedizoke.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8560b150a175a364d67a4b58d0999581/9353065692.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97913552729.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/67351805328.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_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 18816 bytes
SHA-256: b2ff7162b3d75b7a32cc9a6d4586654efa60dbd496e8a588424618ea6d1a3fc2
font_01_sfnt_off0001243a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C51 11272 bytes
SHA-256: 5a81aff60b65b63a72cba6eda2c051dbae6a763a9a2f819dd4d256bf75f36b6f

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