Malicious PDF — malware analysis report

Static analysis result for SHA-256 b909ba1bdefb730d…

MALICIOUS

PDF

79.8 KB Created: 2021-07-02 14:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8861f5fd16887420b4a4f5e8800f8027 SHA-1: 7cf6be24156722fc754de554936bb3e5188dd320 SHA-256: b909ba1bdefb730d636bb170afa2d977d09dcae3fa5511dab08b4ae3c46094f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the nature of the links suggests a redirection to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/038e609d49493f02c22e8e132a22e6c7/dasedum.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e0bdc2560---soritev.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-29/20210629161326742264.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3h99noqbr2uhhjcrfrns366457/33927710180.pdf
    • https://menu2uplus.com/images/file/37542792815.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/13107277706.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/cb7a5686a5256429d17eb6ae51723b7e/kenexazokibokuvipumipigi.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b49256a44be3667a1cca3705bea16ac/94455630301.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/5355387569.pdf
    • https://ajitcoatings.com/uploads/39009075346.pdf
    • https://xn--8--clcp3bi.xn--p1ai/files/kopudipewosasupasononi.pdf
    • http://dok-vo.ru/userfiles/file/55015619485.pdf
    • http://airconbank.com/upload/fckeditor/file/joduvomiwunonogikip.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cbee00559c386ceaf5f6af9dc5e7052/naxiruma.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/venerabusirulupufo.pdf
    • https://mmszke.hu/files/file/wedujiv.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6tovtb7e7euil8rbj5vei5b3r4/nigonovidub.pdf
    • http://riggi.ru/userfiles/file/28973456170.pdf
    • https://bravo-hk.com/userfiles/file/31935622803.pdf
    • http://bigxra.com/uploadfile/file/2021051012382973499.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1b41c9133fe6a7ddaa674fb88d5f78a7/sixifaxewupu.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83c7e1fa7---debajar.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0180477c---jukosisaporelabalulevosop.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/85611003011.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=simple+word+search
    • http://perfecturology.cafe24.com/upload/editor/imagefile/97911622461.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_off0000d3a0.bin
51cfaddf6287c4031d4d8dddfa2bb9af142e9db33cc1170efb034e60666eeba1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 10740 bytes
font_01_sfnt_off0000ec43.bin
3b058ea60b48eea5b0193682ef26a364c8c0bb64933e86372b3330527453c2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 16844 bytes
font_02_sfnt_off00011847.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 16792 bytes