Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf50ce7de309e5c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 03:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e901e971b64e189839357af9a312c68 SHA-1: 03e42b202918a199ea81a09094ce409f40e48747 SHA-256: 7bf50ce7de309e5c1e97763fa5b3168d8e231e1eaeedebc1791b2e3919a3475d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. This suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://klinikoral.com/img/userfiles/files/kelisopedivodolemog.pdf
    • http://assytekservizi.com/userfiles/files/59648126179.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4dec35053---3247994759.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16105b489a2bb2---fowevamatojut.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dobogavim.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c87c483f4429ae41052392f582a43292/95290511109.pdf
    • https://alamansyria.com/userfiles/file/73277353033.pdf
    • https://llibreriaha.com/img/events/file/58630016851.pdf
    • http://bk-plus.at/userfiles/files/43854642064.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c275a50df31---65308505692.pdf
    • http://rs-entp.com/upload/file/wudogadusojabonavegi.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/pikipegawawifav.pdf
    • http://video-cycling.de/files/file/44432620944.pdf
    • http://biurod9.pl/public/userfiles/file/gavakevopa.pdf
    • http://lapiadinafelice.it/file/39032394256.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/00e066251ba27e7d27520773c5193778/46854917300.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160beda0724138---gepirudaguwivinusuj.pdf
    • http://amirafouad.com/uploaded_files/file/47216553.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b7ae0a47a12c848ff2d9e89ef2d9be6b/donabexisilizeraninopeton.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a0777e2c8---15648301327.pdf
    • http://dobrasekacka.cz/userfiles/file/nojaratof.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b3fe6975282e217ad0789c4560dfdebd/tapenodow.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/dubirigewimogudijas.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e29462f5b8661258d7ab3bc8ea14791f/76375165634.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160752d819d838---nunujesifobizofipo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fybsc+physics+textbook+pdf
    • 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_off0000d386.bin
b010e5e4efb691c35a6bcfd8c5549987d4a165b1064a7a2adc771941fc80a69c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 17476 bytes
font_01_sfnt_off000100b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 16792 bytes
font_02_sfnt_off000118c8.bin
2a647a2c89b708a9ee70bd6db6b607bb89875a723627f62688b637679d59a527
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 10728 bytes