Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efdba82ade9c21d…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 17:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3304a8e9e288002bf1af40c57f75a55 SHA-1: e54ad66aa32c844419938de6a2d45c5fcdd1a9e4 SHA-256: 2efdba82ade9c21db01963be5f130ebf7c3369cdc2196088f7b1f5c69cc2ffd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised WordPress sites, suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/m7nsnl5n839ittvioa1lv5g52k/2762335388.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087600b13247---zopamojazitipidoramipide.pdf
    • https://famecosmica.it/file/jukajinul.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7nfbaprgcc0hqag2gfglscugu0/gipanozuxitaveponep.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/9743716756.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f44c1f758---37272830692.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e841a0b33e1---tovinojutufapoxeja.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d9052ae4be6f6bcde7a4c05434ab67f9/nafiledopekikej.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2cc0f8f6---wunozanegilunafo.pdf
    • http://residencecarlofelice.com/userfiles/files/tinijizigidozag.pdf
    • http://asijskepotraviny.cz/files/file/55578989901.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/robako.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/abf9hfukkak71tgcdviqbub870/saxebinabazerato.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/9odmeqmtrat8ph1gro5ulrhgtk/piwojolexo.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/1bvqe1pe0ihfj1bbj1a2gafgid/71757496891.pdf
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/16224353534.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5561be101---zegubafijemevolupel.pdf
    • https://limblength-sldf.com/userfiles/file/25992486259.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/fefuri.pdf
    • http://byecook.com/ckupload/files/93545656884.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607717301fde9---30663264254.pdf
    • https://psfund.org/public/uploads/files/cms_files/gazinatukadazo.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878d0eb410e---fikewofatolobelawu.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/rerek.pdf
    • http://akcjonariusz.com/UserFiles/file/rosifusobefodenav.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/79447661239.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=names+that+start+with+t
    • 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_off0000f136.bin
98ca2ad93e326621703c839d21ab51d0750456f6688f9e82dc50304b73409890
pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 17528 bytes
font_01_sfnt_off00011db3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 16792 bytes
font_02_sfnt_off000135ca.bin
d62259b635fddbd8b6b2055545d9dcfb2482322d2fbb3813f8397e463b348c2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 10168 bytes