Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe7e4eea23edce0…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 01:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ab61f1a8f6843635d8c46662a6e1546 SHA-1: fc5fa9b1926d80ab6f843712545899111982fc98 SHA-256: 1fe7e4eea23edce06225fc03db3a154e4859dcaf111d03eb589d03fd67c1e092
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document's structure and URL patterns are consistent with a spearphishing attachment used to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://aep-tc.com/cache/fck_files/file/wuwaluzepizulejolejobisaj.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f5dcf874---15302211570.pdf
    • http://daoltrading.com/userData/board/file/musojaw.pdf
    • http://timandlor.com/userfiles/file/dumogiteneduj.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f5fa1b20e1573068afc87fb19f5227e8/54557311481.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab6d9a14b1---rorutexumoneretiliral.pdf
    • http://alhouti.com/userfiles/file/muvunubapebunupatunede.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a88b998b2---fifezijit.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd0b41186---17645005067.pdf
    • http://www.bash.cl/media/file/dagixunefidilofofabukafol.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4048a066---3201946260.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3d4efd7f---1700235063.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t8cvi2f6p8sppvip9tr3tjgo84/puxuzup.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ferdhbbhd3802njonpssfvk930/rokikuregorudoxi.pdf
    • http://arci-mp.fr/admin/File/nezepubozipoxelotawesop.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b110e70d---vojil.pdf
    • http://rauvuonsach.com/images/uploads/files/muromasajun.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a150630bb---79105865912.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a4684c2b---80325094396.pdf
    • http://stevis.cz/files/file/2607217069.pdf
    • http://change4best.ru/upload/file/funixofosabekixedowi.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430132224455030.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ravi+agrahari+science+and+technology+book+pdf+free
    • 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_off0000e59b.bin
a911f4e6a839e79b4236d0911c20b2cdedcf5a7c2c9f0ffd16523ab27c01ab57
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 11356 bytes
font_01_sfnt_off0000ffe8.bin
1148e654e2a4bf11f168a83245ec7e103a6c84340120eea337cf0847462e8b7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 16684 bytes
font_02_sfnt_off00012b38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 16792 bytes