Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fffe18d9993a5d…

MALICIOUS

PDF

80.6 KB Created: 2021-07-30 19:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84a63a5b77565fd3114e464f963f590e SHA-1: 6f5eeb2dd845d8469601fafbf66f093599236a00 SHA-256: 13fffe18d9993a5dec4525a3844a62552869422d4e2e81b11d93adf68d4b8b4b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites using form plugins for file uploads. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d4d3h0jdrpv5f8erea539ft873/babop.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b971507590d---gedupovupexedupison.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/bovudiwitewabiko.pdf
    • http://www.pattyn360.com/upload/forum/files/5613960580.pdf
    • https://btcauction.vn/hinhanh/file/rokuzisakepen.pdf
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/41521946109.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03ee88d6c---97472394526.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7ef9698c---96716573003.pdf
    • http://salwex.hu/file/rakune.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e851366d3f---jaberafokuvilo.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/o0g35ak5bifcoqm0dtb7pnrh35/sokexejojivifujodajatamin.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b65d0a3d---xemepawewitomazir.pdf
    • http://dokumsuzgec.com/userfiles/files/18425876622.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lunqefun8gklnedk0rl7t32aa0/60601645784.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/66271f8ec563bd8d302059d5809e9961/12391843125.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f871523f---jozupademona.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/nafexibevesojuseni.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3399b2b4---42678878298.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f548da4727---xomukoduxani.pdf
    • http://bjjiffy.com/upload/53133557519.pdf
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/4a93b2dcb4ca08d0096f0f13dbe10602.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1317c96015---58550752904.pdf
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/pafolirokalofita.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=antariksham+9000+kmph+telugu+movie+free+download
    • 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_off0000d1da.bin
c4fafbdcff888b41cc6792dfb0fba3e847a6f8e1a4bc6fabb38296a7f5aec009
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 16984 bytes
font_01_sfnt_off0000fe47.bin
fa70736a4d939e7fba6bdf84d797cdcb6f2ea415064e26958d914f63426cb55a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 11560 bytes
font_02_sfnt_off00011963.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 16792 bytes