Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e996cd04df0d3af…

MALICIOUS

PDF

89.0 KB Created: 2021-07-23 00:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aab8d59ede05c24334b3c49259c36b48 SHA-1: fe42ed6a76a76ec0c2d9e9d055a78a66bb2a3b69 SHA-256: 4e996cd04df0d3af3662bb13a0c6f5a61d8ab1e2c370a50b84bc3055109010f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/69ca2c2aa99827c896f5f5aeed2d7c1a/wusofud.pdf
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/79534195073.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6eafa419f1741f4e616e183008ca4ba2/zemilizigozixopexakataxi.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043bc7c44d---luxezofula.pdf
    • http://dansecyr.ca/pdf/file/nixukapa.pdf
    • http://bawaconstructions.com/editorData/file/16658299020.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f745f3ba427---texapugapufopirajil.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/kpfu9dtcr78ctgrbpsodneqssv/mogilaguzoxenegupidem.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890c4f646ab---57432017637.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607da22d756f3---81022044820.pdf
    • http://nwatchonline.net/userfiles/file/58875797774.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9da2dc1e4---muxipowedubonurinize.pdf
    • http://stringquartet.biz/web/images/fck/file/9577745935.pdf
    • http://rheinmotel.com/userfiles/file/83384689483.pdf
    • http://harrisonsfamilyreunion.com/clients/62911/File/52024529585.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/5115478977.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d15e5ad2---vakepilogagidezuromaz.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/54484909917.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082559a4d75d---80220394927.pdf
    • http://www.chatanakonci.cz/userfiles/file/vexovomugufalakiwanonus.pdf
    • http://eko-inwest.eu/upload/file/bibanewavo.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609698e37aafe---12188467529.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6d854f04---26133880173.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9523d36d4---xefuxebawuwonavugukisejo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=functions+of+marketing+information+system
    • 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_off0000f96c.bin
2355ec7ead5f85265b3acce8a36f9f4b1ffd80e949076e841785a5979292b8e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16536 bytes
font_01_sfnt_off000123e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 16792 bytes
font_02_sfnt_off00013bfd.bin
89b13024e2ae37896a845b25ba6ef324ea447c4e02bda17af6d18c0c8c138375
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 10916 bytes