Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf22bd0d17bd9db…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 08:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f9b2331100303d4f3548ca5e544e53a SHA-1: 222da8655a4a825208fe56dd27acebb96586767e SHA-256: 9bf22bd0d17bd9dbc0bcc2a227769eba44e29d3ec4c35c7cdd1b6d87d5933419
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage existing infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/18922a516b9dba9e094989a537839ed5/kugokerexiponunegima.pdf
    • http://yljx.cn/images/upload/File/sikevi.pdf
    • http://atut-biuro.com/uploaded/file/3924049519.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/840cf4b78b8c3914b393fbdd47037e95/18695820646.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ke6pple36ncat81eigrfmcuvjp/zodijawe.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a85c05219---23386774690.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608874c124168---46280226130.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160961d3ec9258---fivatowo.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb071be17---72033924693.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ufuhstic71hunpme75fflmvb16/28966187303.pdf
    • http://sjar-tech.com/uploadfile/file///2021062406094126.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3aca51605---98612924450.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b4gqkgj51cm3v3lo6ujdv6rs6u/gowonus.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/42c9bu7hvrvog7uk3vuafcf1ne/45702813546.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1qi7im8bfj2pqdnp3b2tdssje4/55526468706.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e6a6f4ea340c50d65814cc829b8788e7/makilogagegibituganig.pdf
    • http://manajrgvaaradhi.com/cms-uploads/files/ginofod.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/989e076cd4585e3f207c9e157ee15fd8/kawekokuta.pdf
    • http://ankurgroups.com/userfiles/file/fumadox.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb2ae495a---madav.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/lfdpaaagfve5gb1ud57dv0fehv/potadot.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6696f3a2---fusugikuvuw.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/71027499829.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+aliphatic+hydrocarbon
    • 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_off0000e685.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 16792 bytes
font_01_sfnt_off0000fe97.bin
35e42d808ab1da6a7784104753885c2248a1719d087e7c86e47848691a9bc60e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 16908 bytes
font_02_sfnt_off00012aa5.bin
44f808325bf66b7aa5f1e502ac8020d33b009cebd98135357b783293c47022ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 10976 bytes