Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccd5a08aebcdb49…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 01:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f35699b4bd2aa04a281560c95dfd307f SHA-1: 6b89ab701b406dcbfdb3348d2c539ba206e71108 SHA-256: bccd5a08aebcdb495ab5a9a45030d740107f73f9660fe796f6c63962c29fd8f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the primary purpose is to redirect users to external sites. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common vector for further exploitation or redirection. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=cocktail+party+economics+free+pdf PDF link annotation
    • https://mrdak.cc/uploadfile/files/30441315700.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/56365281554.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/q4u8cqskepqlgapvkbedvr8j8l/95166495796.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/38209550719.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///bexonuzamalolaxopo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/gurigiwonofaligu.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/82288356364.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/gotigojisusux.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9c2305b30de4c0a900caa65b7a8d9499/85681728385.pdfIn PDF document text
    • http://erimti.com/userfiles/file/61223097479.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe49925589---36302594959.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/70221777155.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/sivaluwuwo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16100d9a704348---62014670961.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc557068043---54190768301.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/81585948575.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffffd022f70---relefubopojiviw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076fb61ccca6---nukimuzomu.pdfIn PDF document text
    • http://parfumkin.ru/files/files/65972173584.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9105d8f644---36595349619.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab7df311a---30696972676.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dokajikexar.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/lutubodefa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e954e689a6---rakumidasilokupajuwusip.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 17924 bytes
SHA-256: 5a2111185ddf01c77305676ee2f316db51240e7e339f97f503719054346d331b
font_01_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 11016 bytes
SHA-256: 90913c2b381e7b08e86122b238c1f2bd2544abf51018855527e525da0b502fc5

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