Malicious PDF — malware analysis report

Static analysis result for SHA-256 101cae45ca82ff70…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 03:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f1b02a117b120033d2bb7d1a5037dcc SHA-1: a7bf40189b5c07dd32d04de6f76e8e9c1697d361 SHA-256: 101cae45ca82ff70a8ce20d5e3028fbd0816bb85632282ff0430ba1581ff066c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link firing further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=operations+supervisor+interview+questions+and+answers
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb429ad596---keralobobovaxolurajozedoj.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106c372aff---71147581113.pdf
    • http://timeyear-v.com/userfiles/file/95287064714.pdf
    • http://szyuangang.com/UserFiles/file///wugonibivu.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13efed20a---7167341214.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b9d78a5fb6bb6ba649ae6eb4709de785/34692088295.pdf
    • http://doktor-okonski.pl/uploadimg/file/7310998911.pdf
    • http://vladjurnalist.ru/archive/file/vorovepegixabisitubutoxus.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082583293b44---54679619336.pdf
    • http://sistersaviopublicschool.com/userfiles/file/1258700985.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160809e9ec5be9---38037449852.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe08a4df4---bawoxuwirurarixesapebiru.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/bowoge.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb29f6b7b0f---36470659838.pdf
    • http://teusz.pl/UserFiles/file/gedakeboruxuwudajesikide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdbc.bin
aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 17636 bytes
font_01_sfnt_off00012c32.bin
41805622d95bf873229febdbde2a698f87801827ae9e3316370c257617b1b98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 10760 bytes
font_02_sfnt_off000144f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144F3 16792 bytes

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