Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e6caa880798d93…

MALICIOUS

PDF

84.0 KB Created: 2021-06-28 21:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 455c55a7a28b3696c1ea868ee5fd9096 SHA-1: 25bc984d326bb6d2f7945e5529eb042cdc80674b SHA-256: 75e6caa880798d935cac4b2a2f3fea697f7e82848d31dbb5952dbdb7217c99c5
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's primary purpose is to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely involving a social engineering lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nfc.soo.jp/file/50795503808.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868f4759999---93953419897.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c3a23bd3---37956430272.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5b5520cd6bb537c3b5af354e19d9b5fc/votoju.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/60f975457b4d5527e235d6a07af8291c/12566177786.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed5723c83---demipofive.pdf
    • http://asokmontridental.com/userfiles/file/ziberer.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fc0d52467e618bc02e92172c1004ff2c/xefadasonotosirofi.pdf
    • https://lawyerupsmart.com/tempimg/file/biwoluvisubopoxutidik.pdf
    • http://gyobel.itpublic/file/87803402935.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/b9me2gv24inq078tcd4ahchj77/69630411296.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/69cc959dc3031244949e1ac1f063edfe/19326151005.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/63180081198.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a42ff44809a1cd4c1e7cb2cb4adc4939/jifumulodo.pdf
    • https://giustofiori.it/file/rosuliz.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/nupizi.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba177250fd3---92269840075.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c017e734e1---pemozefujakinikumogiji.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a199ba1a87b---12030747759.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23467d97b9---zivunevitunokal.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/3kni3icbasaf0fpj0v79flvjgp/vameramizotuvikoru.pdf
    • https://cgeminfos.ma/upload/file/28141919502.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=one+night+promised+read+online
    • 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_off0000e546.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 16792 bytes
font_01_sfnt_off0000fd58.bin
158c7123e8f4b0f457aae7c20c2b8d9215e81ad94a0eb0bd76ab7343b74cfe01
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 17264 bytes
font_02_sfnt_off00012a1d.bin
312a4f39d3efb21841c1d530bb65045e7bc515b4b9c15cd721100c3ea910516d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 10864 bytes