Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a00e24a5f5179b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 14:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce2223d2ed4a355c5b99809160f545b3 SHA-1: d27f2a47ef89cb097a3e516363c7f8dfe7dc4748 SHA-256: c8a00e24a5f5179beecfada584be13e923f31f1420d9d206c1a4d66320361124
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kalmi.ru/upfiles/files/bokudewasuzopi.pdf In PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/22049736703.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17e765cd1f---83530977031.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/47112132435.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/pabugerupudadivetaxas.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/81c1be702c85a224910e93eb9ed2aa6c/marupigaxisegeredumoviv.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5040c27e68bd471feb21a80c98f171a4/vurulukovafajidupibemanim.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/nebopadusabezusemidakej.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/mavifizipare.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072990993b71---nanosofetumagekalopu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0f89add9f3b03c900261111b3053c2e1/13573517794.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/fepovemirepezo.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/wuledibun.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070295ce0bae---12827955943.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/452ffd55d84c4b944660729cd8dc5f3e/82038553411.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/52497202967.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/50953703614.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc83130f3---zidozu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/87886449129.pdfIn PDF document text
    • http://artside.org/data/temp/file/xixoxutopimebetevax.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/bibizajuliravawi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b9529f86f0f---kuparimagevasirom.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/61870356731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cara+memindahkan+word+ke+pdf+secara+onlinePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3d5d1af9391b864e45e206e9ab325bba/zakinisatiliga.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_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 10996 bytes
SHA-256: ff59b8b5be6ae994577cd1c4675a2cf2607f72dad5672dcef947ee3b0e95a6ca
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 16592 bytes
SHA-256: 96352a507da11c4bf74427b169b38c5694f86fec48849a542875fa5da788b63e
font_02_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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