Malicious PDF — malware analysis report

Static analysis result for SHA-256 756aa68af8ce4de6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 09:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 256217ede98f99bf3c021c18a22b619c SHA-1: b12d364fdd32d7a4653e649b981198fe10066b8a SHA-256: 756aa68af8ce4de667eab7acbdfb1cf68e1aec178b0cffab73542957f276fe00
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on low-reputation domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=what+is+companion+device+manager PDF link annotation
    • http://tuyothuyluc.vn/webroot/img/files/2416900835.pdfIn PDF document text
    • http://rld-carbon.ru/file/9550869398.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/96401238889.pdfIn PDF document text
    • https://banghenails.com/upload/file/50365482651.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/87442694527.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e1894f7cd7c210082a3c52150ecb1c7c/5702005852.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/jopubutixaxexajalobikosa.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/dizerovunimanumuka.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/tikib.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/16799994757.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109031418165232.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/4705973491.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109110158251751.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/pakuwoginotolifilufo.pdfIn PDF document text
    • http://slovoveri.org/userfiles/25828918830.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161316bba47023---5723449076.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mapijilu.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/tupiwonevowumepikuruxej.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/peviwivuxojuzuro.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/sanuxa.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909160747_1107647742.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bf74638---mazokazezewaxeduberekos.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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 15964 bytes
SHA-256: 21094b69fe04c0200137fe7fca7791d5c8ce2d6a9ceef7bc104fb07fedea8f43
font_01_sfnt_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 10976 bytes
SHA-256: 396cc3ef241bdc8c40530b9cd450e17902587c297618f1c45e550433ec1e8b29
font_02_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1