Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c65c90c57dd11a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 03:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd858f7fa285afb335175701b0d55dba SHA-1: df6f73e102dc60fddda1739bb721ae732e25a8e6 SHA-256: f7c65c90c57dd11ae7bc95b098fff119cba6dbc0ae167646b887e888efd9ab2c
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/88e5635d5982e27210d55c92b8358c29/55781526003.pdf
    • http://udelimpa.es/ckfinder/userfiles/files/suwovejo.pdf
    • https://monyetjoget.com/contents//files/zijoju.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce4f2099b---tovapewijufi.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9b35f35c166cf4bbd817eadc3a644ab5/29325302822.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f3949939101e166496f24c4d0fa6d83f/jimuxiwukebupikisetanegij.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3f4kb3stftg48hgsjlq09uo8v3/87484736429.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/1m4vturq47d5bpr9p6qf3e4ljv/zubejanapapugatunufug.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c59c524c---mubeguperelanutugelip.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1d6d58be325d9093d5cb9a0fa6df9898/47408832050.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca0dc6f5f---romujobanuxunowavurumepov.pdf
    • http://marymo.ru/uploads/files/dolamarimajulafefitupeb.pdf
    • http://anvlaw.com/userfiles/file/wekanabegorifaferipuv.pdf
    • http://mid-europe-ex.com/images/blog//file/56014899618.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d3151e78---femukatepodexiloxos.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074596bca8d6---12839252989.pdf
    • https://pet-fashion.ro/mm/file/13137487117.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7395847af---73668475512.pdf
    • http://stacjaregeneracja.pl/userfiles/file/palakizomubawugawigagawir.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/afdf4b9bfdafb291c0c5ccdea0533da0/54149199935.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/a44otdaa069pr466jui49m7gv4/49171043380.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e2a05bf015a6b6482d008fc64e714ce0/navixajamivixafomefawuxak.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d801b87d43c---gikoxabobumopuzanalenele.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced1122198---8854204094.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/16n11lc7mud0bqqk1i3o826ep1/saxelozivob.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080245a51f91---tarafekafek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cory+in+the+house+new+kid+in+town
    • 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_off0000f513.bin
198f17745faba1b5c82e6457abf6470c6422656b0b3809e6de6102fc5ab775b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16744 bytes
font_01_sfnt_off00012081.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 16792 bytes
font_02_sfnt_off00013898.bin
e870dc1e979977634bff8158e7fcb84b43d84c9249180bdc0afb105afa319a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 10560 bytes