Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab148cc7c33887e…

MALICIOUS

PDF

91.2 KB Created: 2021-06-27 07:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0026c490e81dc713ca38d4a1c9dc7fb1 SHA-1: 079ee9464f86d42c1f8fcfc5f066c7e8f63b23be SHA-256: eab148cc7c33887e8f84d48fd0915626777ce41aafcbdda1b92262ecafc4d064
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, suggesting an attempt to exploit search engine optimization or compromised content management systems to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/04fe0a59b41f4d2a2319dd502b895ec7/botekunopu.pdf
    • https://unicornccc.com/ckfinder/userfiles/files/radozovujivelom.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/xozodagusabujomujesa.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8b8b008eb5a61bcdb045f296a372eef9/wefazuni.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/92114914691.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/27cf104624604488774e5f4067b185f2/47662546224.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f14536019af02aa565249828a18f0a2f/jolunumevebis.pdf
    • http://gomientrung.vn/uploads/image/files/zazeto.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/a25cfe08c99af3229aad29081d564612/rutodinofexiwagevekejur.pdf
    • http://transinfosoft.com/userfiles/file/zuxurani.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/volm7b1u3ae1em471iuvahkvu8/131296412.pdf
    • http://andrelandberg.com/userfiles/file/14574647243.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b4cde53c1---vutagepilenut.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/jmkj31emgfa1jcdkg4i74p2qrc/tusenawezib.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dac6532b8ee2d4bab6a9967299087122/rodiserufoxisaf.pdf
    • https://kurtoglumob.com/upload/file/42182306868.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/208f751e148d7143a6d57aaa35d9ffe0/dojigofubiguwulafedi.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bbab2cec4a91bf7a6046490dcc55e2e6/39125637851.pdf
    • https://t2sc.me/userfiles/gifuwirakofaxetomanolivat.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/rosazulo.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c129cdf0256---2138874128.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4152c6a1ff69f0f6bbe41302a0f00cb2/60268285303.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d934ce1aa9---2861805817.pdf
    • http://matstravel.ru/userfiles/file/wubiparotasoti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+companies+to+work+for+as+a+college+student
    • 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_off0000fe43.bin
9bc4d7c5ad42c8a91e896e9c5ef5755b194d1c5b7d9954b544990c8985766e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 17688 bytes
font_01_sfnt_off00012ce3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 16792 bytes
font_02_sfnt_off000144fa.bin
9189beebfd6a580e63852e05bac9f9613e48e8f66d70b646cb08ccbc08676c60
pdf-font-stream PDF embedded font (sfnt) at offset 0x144FA 11292 bytes