Malicious PDF — malware analysis report

Static analysis result for SHA-256 9434f58e11718261…

MALICIOUS

PDF

82.6 KB Created: 2021-06-28 00:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a5e7dbb36c0f66fc0cbe478463dee4e SHA-1: 3c5142cc3d2f96e543091ec376b80a923e9d670f SHA-256: 9434f58e1171826154f33669cd12a104bea60f49c21b6117197a1b72e5818102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/53174101397.pdf
    • http://ledins.lv/cms/file/26961393512.pdf
    • http://autodilykanka.cz/cmsimple/images/file/vevola.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82420867532.pdf
    • http://yomamasushitogo.com/uploads/files/11107838850.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ae6b00a68---sakelu.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f03e4403---binewov.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc1906699---1385839099.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ce5f244bc082ace5e706d6e03979026f/susulafavokaxoxivonebego.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tpr9arvo1h2ficg978d23l68gc/pafelokapoguledanidov.pdf
    • http://cedule-plachty.cz/files/file/88963489041.pdf
    • http://vorne-sitzen.eu/pcms/content/file/wifivopege.pdf
    • http://clarksville.net/wysiwygfiles/file/bijebolutorepa.pdf
    • https://uclerbaklava.com/resources/file/zujiboxananekefulim.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/4qd3ithr5qbbh7f03g2gsrjb7g/winafakupin.pdf
    • http://cupta.org/userfiles/files/20210616003801.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/j3ee6j2rnialklbogaqu71u6f7/87132594497.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff8e2939b---temetitorixep.pdf
    • http://lookkorea.net/userfiles/file/medenakedinetojoxag.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1a0a356123bec3e34212142cb855882f/12264122454.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/8q2g8kd8sq2733cvn9kqqvk0u3/kebibupofifoloz.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/vakufoxazokubidebi.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af970fb4a7c---6276982605.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=things+name+starting+with+u
    • 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_off0000dde2.bin
f87ec796d307ffacccb39b6ff7646d9caef1e3f7b230e14c3d44676c019be0da
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 10536 bytes
font_01_sfnt_off0000f5c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 16792 bytes
font_02_sfnt_off00010dd2.bin
fb998838f319a9d46ad7f126e59d2f786d22c6935cdfdc35510f20c9cbc447dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 18640 bytes