Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f3801821a3beab…

MALICIOUS

PDF

94.7 KB Created: 2021-09-07 07:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a553c039d2909431faf034644846601 SHA-1: e9452a132c14f6ac0816acdd40917e8cffb03c84 SHA-256: 35f3801821a3beab2d2df3b52e98893ae280768a2b38939066c7360b4352392d
196 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 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick the user into installing a fake browser update or extension. The numerous embedded URLs pointing to compromised websites and link farms further support this, likely serving as a distribution mechanism for malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smidgel.ru/uplcv?utm_term=transtorno+de+personalidade+multipla+pdf PDF link annotation
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rpleo6fpto92ghimm33d3qieug/nawawajalapobixija.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136d75e0eb95---fomonopukigarokazemejur.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a67f3777---71603088671.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210818170754.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/91027554086.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/senaxovubujozik.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087443f6916b---13457918870.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210610_6CA4FB55FBB1B24D.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/31743659345.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/91738524598.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/95f89f61c5e63ea0b664c0886b71c3cb/45666145632.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/zojokovepojamo.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/niwojukaxodubiworenepez.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf6a39dcdf---resox.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/watij.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/31486009375.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b532e27569e---22304517824.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7842b09eda---sadarelirudedefigijutijiz.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb066ef22---14067357277.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/5029873698.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089841f49ec6---82031093625.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/94404361482.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 20348 bytes
SHA-256: c67051904908baa2fab2acbb2c13a455e891818f9ba59e9a4b14a8372cfda665
font_02_sfnt_off000154a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A3 10720 bytes
SHA-256: 4684a479d9e0f604a3b498bc2ee92a733d343ceec861b7ee6f2a8f1250461e5c

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