Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df2c87f700536f4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 23:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 344e3c1d0d46938a9e229968efd6edde SHA-1: 2e4dbc2eb8ab3ecd7104db1865f08c6cf6264b76 SHA-256: 4df2c87f700536f438b5ebe74ed5b65f7eb8eb2a9f3b4c3f47fa21cb7e471cff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://synerhu.ru/uplcv?utm_term=city+racing+3d+unlimited+diamonds+and+money PDF link annotation
    • https://habibitours.net/ckfinder/userfiles/files/gasuguwesaxoguxekevewixa.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/7559318785.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/31701757809.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2aa6abbf---10284970727.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/dukufisakelubu.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/kinomimobogafupa.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0789acf5cb7e2947aeb0fae72be54502/51784372287.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f18075933d38b39b3ca719b8a0f357fc/sitakamuf.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/sesonanebixix.pdfIn PDF document text
    • http://epplast.com/files/file/26970889134.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/5002596600.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/jijixadevela.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/46315123944.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/mewusudupoxojo.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/majapuruneva.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/zoniwiginupi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7rinm7gl4rpol0tf8d5j1ep6hr/suvowoxedijevena.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/14410068318.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/18190203023.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/74300331476.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/89465597982.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/8663293562.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/82622388675.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/28273716055.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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 17760 bytes
SHA-256: 1974745330a3880dc5760dc08ebfcbccc773dec34cd4b485778a77e91407df27
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 11128 bytes
SHA-256: 0a11667803702ba8fdf3f7c2dad0dc2dcf068ec281234e5990c4d7882d29cd4c
font_02_sfnt_off00012172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1