Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e75b4a2a47d346…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 12:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 176610854c510c649acfee524854cee4 SHA-1: 0825124b91422e2153e00e228abaa2f63e5a1d43 SHA-256: 14e75b4a2a47d34695ca8701b698ff074d9aaa76b2570b0b951129c9fdc40f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites, which in turn host further PDF files. These links are likely used to redirect users to phishing pages or download further malicious content. The document's structure and the presence of multiple external URIs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=tc+helicon+voice+create+xt+manual PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/51c5370707fb2f09bd785c9f7a04e725/rumuvonubo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0bb6c70d---nexopojepovupid.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/38200442159.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/pupebubezabosaverujudos.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/50126346327.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/54595006742.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/rusewoz.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/887e092d6812f624db5e5fee3e792356/nimutujuwokatavas.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc766e2f9---52584929198.pdfIn PDF document text
    • https://avenue102.com/uploads/file/nebijixikefudinirudonow.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210704082120.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/savokopovi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f162b835920693dd72cdfee7100bcab1/51202644782.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3ofhpppa92ao8reg4gfv578b2a/11021578553.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc4928c7b---34532869298.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16073129392dd2---82819676611.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/5254945812.pdfIn PDF document text
    • http://ux-school.ru/files/files/zugawujawowiwemovexaxemu.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/nijefonur.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba483eeee9c---22381438242.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/93211266174.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/48329508899.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/xenufagogaxufoz.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_off0000c14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 10556 bytes
SHA-256: ebd863144fb06453584e7a04c28cfa8f4792b83c104728dacbfe6472bb9afca3
font_02_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 18488 bytes
SHA-256: 36dedf243b5c5fa3cac7dddfad7d78c49434b8900dcedcf80cdaa1a39828a28a

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