Malicious PDF — malware analysis report

Static analysis result for SHA-256 7210855ac2a58ed5…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 15:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70e5e2b4c180752a2fa8fd829395cdc0 SHA-1: a678de9e9917a751fb12422ec600de3f6ad0cbe7 SHA-256: 7210855ac2a58ed50ba16c5a6a78715c341712a5b1378ada0828f636c7feab32
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of a download button lure suggests an attempt to trick the user into clicking a link, which could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://risorsaterra.it/userfiles/files/77840217024.pdf In PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/wupozowu.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/bidaz.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/fabusesize.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/tonirex.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f52f180bf---13214150144.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fp00pl6oesdfu0fge3h8oh0ij2/sasuwagatebigurasuwef.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/51050017227.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/nuditizuzujekisizoti.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7f7ddcc29eec03e66c9b8af67a1ca1a1/fidagalirunijota.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/riwixodosiriwepenabepir.pdfIn PDF document text
    • http://scantech3d.com/files/60610216874.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/joguwuraxigaloladorefirim.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080501343697794.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be427f93ad6---tujudemuvivikosab.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff36914626---36860162090.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/5233733725.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3480cd046b---78404652008.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s7597m03egjhr3ifplv2ojr2lf/nukowexomope.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/guminavarujasuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=microbiology+book+ananthanarayan+pdf+downloadPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ac5144e40ac660082b38dacd5d2b7f76/94448301614.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 18364 bytes
SHA-256: cee0ff627294052ee6cfcabdbdde4412832b56bb420e86fec39c7757d043534b
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 11024 bytes
SHA-256: 07dd0020e5fba7034d84544f5c65197f4c72393ad91b10e3782c960b52980285
font_02_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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