Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d721c48886f0f9c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 21:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 167f5a06af32cda62acdef888001e893 SHA-1: df71508104e7800e8802861edc21727159a1499a SHA-256: 8d721c48886f0f9c18003b2c12904400c96c72ada1260262925873392abaf6ea
196 Risk Score

Malware Insights

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

The PDF document contains a lure suggesting the user install a browser extension or update to view content, a common social-engineering tactic. While no scripts were directly extracted, the presence of numerous external links, some hosted on compromised CMS platforms and disposable domains, indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.anjhimayath.com/upload/file/64758838894.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cde0225023---49836762071.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/pomenu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93afe99429---mozububavutimatodivugav.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/66591087144.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/d78fe50f69f9917e41d3feb984bb496d/78872770417.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/48586693341.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/65044960189.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/wilaxog.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/muwabimugapitazafa.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/96a261740c3cac5efebc7c3b5ec14b3e/31388349868.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a90494b7f70dd1ec87e424cae2d2eb8c/zokedajuv.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/muxudorilixowenokavewevag.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/romame.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/47fa56ef62fce88f038894cc380039e2/51325749114.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210703_194338.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869a76e8d3c---kevasusuvipipatoregufaget.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/7896116935.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/6416415469.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41554803193.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/43195348137.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/97283203082.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/61943922329.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/69868240686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pdf+compress+online+150+kbPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 11064 bytes
SHA-256: 2802e01f40c394cc52bea2f9323d771b85def8eb70806135dbed723111364053
font_01_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 16920 bytes
SHA-256: d9ad6a7215bbae280e181c9b2c14b72212ffb6d2faa551653c2b1a1885f4fce1
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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