Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9df23707a2e245a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 17:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b431acc429c8587d2246b2bd36fd631 SHA-1: 37c7bc7fbbbab2031596c829e327f90ee259c096 SHA-256: d9df23707a2e245a1951cf2c3c09e0cd5170cbfa855e33a3c450ed402638179e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. Crucially, it includes a 'Clipboard command execution lure' heuristic, indicating the document instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious payloads. The presence of these indicators strongly suggests an attempt to deliver a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://ventilatoryzlin.cz/images/file/8899135299.pdf In PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/84564400273.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/2080535455.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/lukuto.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161321f180df96---kitekudonufobuleloxotokut.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/67062675305.pdfIn PDF document text
    • http://dmkert.hu/files/file/73788560212.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/porularikusirokax.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/favevodelujid.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f17c1a92af6e9e38249f827807018e7f/dajerobaxifiminebotu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///71740755169.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/gazekibigemiba.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/98698115136.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09a2e8b0b---17265531075.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/35856097186.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/5603970722.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/68407518300.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/lexunatumoga.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fogok.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/minizofilujopivene.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/rekuropavotudimuwedexe.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/tijiguninabolukexanorobi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcb161552---runopexomejep.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061816399376.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/20412413104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=contoh+skripsi+teknik+informatika+pdfPDF link annotation
    • 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_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16620 bytes
SHA-256: 969305f5c0c1dc7833f25baae4b6296c934165624c9f5ad7ca38f6c109abb103
font_02_sfnt_off0001327c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327C 10840 bytes
SHA-256: bc77ac7c96a72c10b97b34476efacb8933582147f5d85513f3fa606398ac858b

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