Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab192810497597cf…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 10:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d8015c9310764e745d23d560ddd2a6ed SHA-1: 47457247db954d9b8fb8dc2711df89e2df30b28f SHA-256: ab192810497597cf888bcfb96ce0b1edf8d215648914e37875958636633d7eb1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous URLs, including those on compromised WordPress sites, suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=plato+divisor+fresadora+pdf PDF link annotation
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/db088c4ff655783defc2f37e8e33de4e/15770089435.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/26611616403.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tudarasikolivoxutizejede.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4c79b76e1---54812922333.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/90163632087.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/77747543069.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/81723586277.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/5351624214.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/86461890316.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b298246a41c---64026525701.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b95b9252fc6---98078380709.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/bavefotogis.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/1069794907.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ailj4ksajokh19n4ejv6esqhu5/navakipaxixoli.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/51231439131.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/sutevokiduwifabafa.pdfIn PDF document text
    • http://hnspkjx.com/d/files/naninusuwetadix.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5a62bbdb94692144a838f34ff29cf1d9/27549480631.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/11750394785.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///93556164794.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/15512339648.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/zanolixavoxilivuvol.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/lufubenowunetoturexexe.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_off0000c64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64B 10452 bytes
SHA-256: 9f946a854a185c8a376f4c5800eb59f4b7d0ceb972a3b5d385911951b1c91fb4
font_01_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 17464 bytes
SHA-256: a176ef258a19d5e2864b267d2a4a7e2ac04ed8364305dc609ad2de1428def3db
font_02_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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