Malicious PDF — malware analysis report

Static analysis result for SHA-256 314b7bcd2fd1526a…

MALICIOUS

PDF

84.3 KB Created: 2021-07-09 04:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 559d8410b0f785e21ca4879e7d42816d SHA-1: e3651f7ff8d96cbb0b2dea468f1114b54ffa77b1 SHA-256: 314b7bcd2fd1526ae0b53ff936462f2389215ff3615db2a0d91c24a8be158b4b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bogieclassof67.com/clients/71235/File/84749736459.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad8b489c4---renadaju.pdf
    • http://accu-chek-event.com/ckupload/files/fejazujotipoxu.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084139fc8034---20002778482.pdf
    • http://modern-pro.ru/files/file/69008874134.pdf
    • https://menu2uplus.com/images/file/jesinimabad.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2580a5e9---17425788026.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb956caf33f---jaweb.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nhf644r2vm5bfhhpihkkq2h743/41205341666.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb84c95915---20411378546.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0d19980a26b509924b7e7354859bc54c/1494388047.pdf
    • https://akbaturgame.com/calisma2/files/uploads/74788454916.pdf
    • http://krevue.cz/UserFiles/File/60978272378.pdf
    • http://innospectrum.eu/hirlevel/file/xisokotefitimubefazo.pdf
    • http://onlineexpert.in/userfiles/file/lekulibar.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/19072365174.pdf
    • http://www.asslar.de/downloads/xapun.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9ef894dc0036d8725d4a2ab4fe81af30/mifuzemororukimujemo.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/46605253976.pdf
    • https://digireg.cz/upload/gulisumixinijuvunedaf.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a93348a163d036d42ca26658e63795d3/56434118063.pdf
    • http://industrialdevices.in/uploads/nugib.pdf
    • https://tomorrowhubs.com/upload/users/files/64222330749.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=is+foster+care+income+taxable
    • 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_off0000e611.bin
61b2e94254c13cfcd8ff6781fa3b51d730f190fd44b9d3f0266e06d69e6ef3d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 17640 bytes
font_01_sfnt_off00011395.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 16792 bytes
font_02_sfnt_off00012bac.bin
37cf000d7ba3f08255acf1b1379e5dbf8ad356b368523cdb0b685677a336b8e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10688 bytes