Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b7cf2b1642e508…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 16:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a35d94c7742a7d54c7b55c3a8274bd85 SHA-1: 4b8e6c916db2cbba1cf45aa65216849f54289a6e SHA-256: a8b7cf2b1642e5083fa5e1ab164811a6cfcb32d4a079764a8544e8c183515bb5
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to download and execute further payloads. The presence of heuristics related to remote support lures and download buttons strongly suggests a social engineering tactic to trick the user into interacting with the malicious content. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=share+screen+with+pc+android PDF link annotation
    • https://tierlistei.ch/downloads/tavone.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/62249829631.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/65903305430.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/ganesaxesik.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/55763256192.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/68213845541.pdfIn PDF document text
    • https://andhimazhai.com/images/files/xukelepoj.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/vipupifunugud.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd1be60c5---40289260055.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/72528359046.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382823d9fc3---57871039750.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/54231777734.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/vozosejojado.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161432bba1679f---99137607940.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/zaginurasidafaluv.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614396381c40d---nuziverigupapevejubene.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/mefejojejudatekameweti.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632080859.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/bomesonogonutefifewug.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/33908146056.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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 18524 bytes
SHA-256: c43b2076b1b9005f98b58804e182c519bdcead6aa7f3ba2cdf64f559cf0ae858
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 10728 bytes
SHA-256: 9061feb0a7652950303b4429eb84118c6876e6224debe57c9b2fa83b123c8d79
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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