Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad682e7632fe77b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 10:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ca9847bef855ead6f15d0932fc5399a SHA-1: 770a402090adbd1da7c232e6452546778f44bb2d SHA-256: 8ad682e7632fe77bcaa3959666b3d2af514e054c64acb9e4349d9b71d1a5d23e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, directing users to multiple compromised websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=call+recorder+for+xiaomi
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7b4a9077---11119881096.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210919141424.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b7bbfec41ac664a6feebabce3805eb13/dobupoxugiwafopawujakinu.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/93476048305.pdf
    • http://monthclean.com/uploads/files/202109031021533554.pdf
    • http://huseyindurmuslar.com/images_upload/files/pisekopomi.pdf
    • http://alianzablue.com/aym_image/files/woxanaziwodiw.pdf
    • https://crbz.ru/userfiles/file/31694672945.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5a76c6c9df8332e0dac25ff0cee87e77/26706786284.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/rosunofakomotus.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/7259407640.pdf
    • http://alltechsro.cz/files/sixozonotojutukijuvakav.pdf
    • http://citranco.com/users/files/35909493327.pdf
    • http://inphilong.com/upload/files/nudib.pdf
    • https://brihat-group.com/assets/userfiles/files/18365047834.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/esdnbo6dkn9jpud5e9iv8aoa1t/3316311288.pdf
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/76579090425.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/46805059261.pdf
    • https://eclearusa.com/images/file/94836077313.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/27429496768.pdf
    • http://hairfibers24.com/upload/file/nurifezotidupolivugeje.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/24177496907.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ce48c261---92628601583.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_off0000e84e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
font_01_sfnt_off00010060.bin
3b12c1fe3167b86070202216cf1e9d061d54a7cde6557df760fb64fc6ae3124a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 19068 bytes
font_02_sfnt_off000132ec.bin
64980e2a15fbb3deb95dfc0b09abc5bb5757ce924d31d8eaca88c5011f90b342
pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 10400 bytes