Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8774b62bad16b3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 01:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0af5af534f1219f0ddefd52e022cec0 SHA-1: 358aec1cbcdb91341a4a07ba95112d37a12f1795 SHA-256: 9b8774b62bad16b3e074afddc51268fbdf1f5a4fa9813d0e7bc9d940285d1d57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://hoshitorionline.com/uploads/files/fixigibipobewepin.pdf
    • http://vatlieubaooncachnhiet.com/userfiles/file/javukosefagajomok.pdf
    • http://qianxish.com/ckfind_image/files/40656781561.pdf
    • http://sllight.ru/design/img/upload/file/lisisofirax.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/dinujatizodasorigebede.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ec202d69---gatolopojewapovekiberosa.pdf
    • http://waypl.pl/upload/File/kojiteli.pdf
    • https://maggies-handmade.com/UserFiles/files/mowanogagesile.pdf
    • http://yevres.fr/ckfinder/userfiles/files/tonajusod.pdf
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/75919551140.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/60b645620a56d4285566c0f7d232ac13/kejitofiwovonivojigus.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_141552.pdf
    • http://metapolar.hu/tmp/jowazefomowuluxupokasowij.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/rusoxevobenolem.pdf
    • http://gesundimjob.at/images/content/files/5045269252.pdf
    • https://cezartravel.hu/userfiles/file/85414625183.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210912_D71F3D9938B8C5A5.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161316b2817aa3---domasimexegu.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/xirujovoni.pdf
    • http://raczcsalad.hu/files/16837076630.pdf
    • http://mawaevents.com/uploads/file/sudarebiw.pdf
    • http://svarovani-tig.cz/userfiles/file/61253328032.pdf
    • http://due.pt/js/ckfinder/userfiles/files/16963183893.pdf
    • https://ateliersmq.com/pevron/www/img/file/64361451672.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=123movies+spiral+from+the+book+of+saw
    • 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_off0000d3bc.bin
4d2032aa02212fba0bc3839b56d2347d41582e31f228e6d4d848aa715a027130
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 18204 bytes
font_01_sfnt_off0001038a.bin
3670f415b9730109a329f819ac8fc9ef9f86d22e156bdbca0171bc975ed8a83e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 11148 bytes
font_02_sfnt_off00011d83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 16792 bytes