Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844322e32d15871…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 00:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00d0253ebdaae8f7c9d1765ae11c3124 SHA-1: ec482e1815ec1a63aa925603b202c720da5288c3 SHA-256: b844322e32d1587128784df27575122f1fc94c5335a51b464d1cd39a68091c52
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs a social engineering tactic by presenting a lure to install a browser extension or update, a common method for credential theft or malware installation. The document also contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hueide.com/upload/files/50632049692.pdf
    • https://tylbm.com/Upload/ckeditor/files/70796357008.pdf
    • https://rajakedua.com/contents/files/napole.pdf
    • http://archidaldegan.eu/userfiles/files/81852959894.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovabuworiwibejuse.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/80f065ef643a7af076f96a12dc6de184/46533422009.pdf
    • http://sentai.cc/data/file/20210912_230411_479.pdf
    • https://razredna-nastava.net/files/63262305677.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pv3tgdu6tjp4gkbf3jl4643lp4/69206320411.pdf
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/22507226132.pdf
    • http://share-world.tw/userfiles/file/lorutasakanetufi.pdf
    • http://kdekdyjak.cz/data/xivodifovanep.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/41060d3be626fa261370c9fbc1c6183a/purojefitivuxajudated.pdf
    • http://hak-al.com/resimler/files/demememo.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/roduxefilimevasogexeduz.pdf
    • http://studiogallerani.it/userfiles/files/10425944460.pdf
    • http://galluccifaibano.it/userfiles/file/78783816103.pdf
    • http://gmart-express.com/demo/uploadpic/file/muwifobepeba.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4c5dfca9b3bbbc5c6215b5bdec8ea38a/85595652933.pdf
    • http://ajivikafinance.com/userfiles/file/gosadetovugosadisudoge.pdf
    • http://homeopathyhongkong.cn/files/24421100556.pdf
    • https://geneticapanama.com/userfiles/file/29967426372.pdf
    • http://cybernet.asia/UserFiles/File/jiriju.pdf
    • http://capital96.com/userfiles/file/70798153519.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gravar+chamada+no+android
    • 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_off0000da50.bin
fe62731cd679890bc7587932a9f8b34e36d4c431934200cea6da33dd1d6c2dc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 19196 bytes
font_01_sfnt_off00010990.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 16792 bytes
font_02_sfnt_off000121a7.bin
1502a4fbc7bfae92abfbeb7f5dad693c4ab43534afa22908ca603bfc8ad44e18
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 10296 bytes