Malicious PDF — malware analysis report

Static analysis result for SHA-256 d184055c05b2e9c4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 06:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3e848f6412e08f62e43635cc5fc1fa7 SHA-1: 169738f8477d222ccb71503213a1ff00fdde106e SHA-256: d184055c05b2e9c44cdadb6b81003bb7b7e5a95812e3a69eeec37e9ce9529211
164 Risk Score

Malware Insights

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

The file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised or disposable domains. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://bevelec.com/bevelec/dossierMois/file/40559193240.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c31875a94700b88e50776e5c13822e44/fumibupinetup.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/18417849078.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/nuroxilokonizo.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210813064704.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/51871949589.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/64103030048.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/walugazajekakaradozodux.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/jobakikuxabevomilimeju.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/gobozufan.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b786fa15332---toluwazefomoz.pdfIn PDF document text
    • https://bio86.net/fichiers/79965974483.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/vazowunamiva.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090217235712.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b109a945ec1---47907746049.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rvapnf56ntkvk94tg70s2cir6g/44240545131.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/36369367898.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/83176806203.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/31820530095.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xevimux.pdfIn PDF document text
    • http://generoussecurity.com/uploads/nevabuw.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/21778907408.pdfIn PDF document text
    • http://195exim.com/datas/files/nibazafotikizigukem.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/waxenawelowixifedovedula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=design+and+analysis+of+algorithms+notes+pdf+free+downloadPDF 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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 17588 bytes
SHA-256: 3fb5bbf3c81c9a90b004c0e62ecc49fbbd58a2cdb9295162451d59218c0cca83
font_01_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 11148 bytes
SHA-256: 699e1613749b801d6d6e882a7c095b7048a99c7b6bf3e6f8ea6e5264ccebe5bf
font_02_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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