Malicious PDF — malware analysis report

Static analysis result for SHA-256 601371edcb7da98b…

MALICIOUS

PDF

83.1 KB Created: 2021-08-29 11:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d66d6199d89d40dd60f3d53cce95bc9 SHA-1: c085d62f423ca7bca4090bc1a365c5c8e0291d7a SHA-256: 601371edcb7da98b4f8982f35a2759c0adf1e7fde6af1ee4247d679e037fc287
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, with many distinct hosts and URLs. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jarauwerdaenzn.nl/userfiles/file/61431425397.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1fee5ca8---88498361674.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1691fe8f---fakixebaxodutubono.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/327ea7c148fc4c58bcd898a7b9828d68/90293213593.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/74309943052.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1510d13cf6---64667920559.pdfIn PDF document text
    • http://change4best.ru/upload/file/1456517724.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/70708610676.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8aphfmj9us6nd52v20f96ksj63/xeruduvujujokakiju.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/17485912971.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/semixe.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/zepuwotivezozegibelito.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/nizanuxowulat.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/dekazetisegi.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/47488798926.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/vl6v4lds4aho43ebpr29bqo1fk/87877140580.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f70254ca3ec6ddf3a906e85c01324d41/xulidewabazunep.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/69954066838.pdfIn PDF document text
    • http://whatdwellswithin.com/file/48521765894.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/2ncr6lsibpf065b6cm8vef41m7/nililegejawideradana.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160859e08cd7ce---62139864069.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/bovugafusuxopinonikuri.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/fuwimipureli.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c59663c892c---21497636611.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/653d73f4e9db614c4b6ba36a475afd6b/96949293260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=competitive+crucible+ranksPDF 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 17876 bytes
SHA-256: 54d72c47d29cd9ab2f60683fdc92a0a4cbfb762f31121141ed31e07790fa99e8
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 10964 bytes
SHA-256: 7f585d26b1efeeb819035f4b9ac58adb113ab6c67c88a7b3913f77c2a5048b35

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