Malicious PDF — malware analysis report

Static analysis result for SHA-256 415aeadd6961ffa8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 02:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bbef3ff64f2d5b61f598db964375fb6 SHA-1: eb72302e54e3336929f700ace181fd04ff15c005 SHA-256: 415aeadd6961ffa853cd73f5b957843e4599b875f555d6448b49e94c1198afc8
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or exploits. The presence of embedded JavaScript, coupled with the URI heuristics, points to an attempt to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/1562130705.pdf
    • https://strechybenesov.cz/content/nabodugusugakodopilevisaz.pdf
    • http://thienthaopc.com/upload/FCK/file/24547152005.pdf
    • http://yarpb.ru/pic/userfile/fazugikepogofe.pdf
    • http://ombs.ru/uploads/files/lubufozotizel.pdf
    • http://viquadro.com/userfiles/files/pewaxabobumug.pdf
    • http://finadev-groupe.com/userfiles/file/xufirani.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e67e05f08ec8b3a32a2ded89d8b14279/modet.pdf
    • http://skmsm.com/userData/board/file/12512268773.pdf
    • https://olterus.org/contents/files/kemubosinitedamenufudasun.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/joxesule.pdf
    • http://farmandari-sarvestan.ir/images/news/files/53500865398.pdf
    • http://kaitosushisb.com/uploads/files/64568451163.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/1422720556.pdf
    • https://gulf-rope.com/images/bulk_images/files/fuwiduxavasila.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613060ff2a671---78938074498.pdf
    • http://tetrafluoro.com/upload/files/64361895154.pdf
    • http://perles-del-beya.com/userfiles/file/nugepiwenuvox.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16140efb17d402---31898186675.pdf
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/gaxojidezateleladikolezu.pdf
    • http://shinies.ru/img/lib/file/vomofajesepu.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/silelefafusunanomukus.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/90629589277.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=floating+window+android+10
    • 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_off0000c726.bin
6cd8d18c890358c09ab1e337d2c6771ec543e538dbb05ba0607f2494c2c438c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC726 17392 bytes
font_01_sfnt_off0000f42d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 16792 bytes
font_02_sfnt_off00010c44.bin
5f0a55877ac011320c98966486b32a844644256560d67b154a7cbbf1691766c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 10360 bytes