Malicious PDF — malware analysis report

Static analysis result for SHA-256 1761097a06f2c8b3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 11:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9948d583b39e4b352197ce4b419993f9 SHA-1: b80976298cd85aaebf6dad79aeebb558d73ce3d2 SHA-256: 1761097a06f2c8b307aae0b132762885eecca2ca73b76c4ffdf3f71632248dc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://garglob.ru/uplcv?utm_term=all+game+hacking+app', are likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to trick users into visiting external sites, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=all+game+hacking+app
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/47306020210.pdf
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/votusunuzuponotekusa.pdf
    • http://gldbirdgel.com/user_img/files/polumufirelikamed.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210917_9A43EAF00AFC90A9.pdf
    • http://www.beverburcht.nl/upload/files/zubijozaxidasugopufefuka.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gemesimipegut.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/21582481561.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7ladpojut3a8etfavdb80jtgd6/22685850344.pdf
    • http://studiobaliva.eu/userfiles/files/xukajewifu.pdf
    • http://pensjonatagat.pl/userfiles/file/bomapiwomokizusokerivek.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/64712258690.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/20091180430.pdf
    • http://happyorderfood.com/uploads/files/puroroburetitiresixot.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/8065067611.pdf
    • http://aktien-analyse.de/images/File/80041093332.pdf
    • http://bjjiffy.com/upload/nunozarujubizun.pdf
    • https://birotex.rs/images/files/6281867298.pdf
    • http://rtm-plus.com/ckfinder/userfiles/files/kefasiradigareberejovewew.pdf
    • http://bainihu.com/upfiles/editor/files/87890694081.pdf
    • https://tresonance.org/uploadfiles/lonumuxujikigegigozom.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436d536e8fe---60045883755.pdf
    • http://moscreen.in/cmsfiles/file/68310271638.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/80131148003.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d854952688---89669529582.pdf
    • http://filtrydokoparek.pl/img/all/43405409537.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_off0000e346.bin
8628eba91154e672eb8c2209e66bc1ba0c12e13906a93f14872bd4011486abcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 17520 bytes
font_01_sfnt_off0001111b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 16792 bytes
font_02_sfnt_off00012932.bin
9dcfa7bd7012c292ba92760c9f30604c04fd941dec53f8aa361efb58e1537630
pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 10408 bytes