Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73d8442061c2e14…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 14:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0d2f8124d95ab07f94fe29aa72cae52 SHA-1: 8837aeaea67cb6d41dbe00521d617d0e48caee90 SHA-256: d73d8442061c2e1435c8c9ff46e134a6359f2f9ab63d28232c6875e7d65d5f0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=download+cinema+hd+on+android+box PDF link annotation
    • https://lionkingbali.com/uploads/file/ribedeguzolisatafes.pdfIn PDF document text
    • http://regmac.net/userfiles/files/13827240671.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vewokifumagotulasenorep.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/gavosom.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/zoripodasebe.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/37260148311.pdfIn PDF document text
    • http://protezas.lt/i/File/18419532781.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sefiwibopawumaxinobonuzuf.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/gegenasuweku.pdfIn PDF document text
    • https://korankertas.com/contents/files/43613827426.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/5726612846.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ec22542f65c0c34a4ede28a439edf5cc/83700304424.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/18724802249.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/susasokovuxibo.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/35004368324.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/20609113a5203f06f45981fec1ea8beb/narutewepewemogalo.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/sulosumidifomijud.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/rofuvozerov.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/21256542925.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb48162a05---89631452166.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109121506109824.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/70447969232.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/87716184278.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/fumevalopedizoragi.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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 18632 bytes
SHA-256: d610cba9a81a3032d608c3f0cb35fec8d5de9f79f6446b16e5a8a71dc1bdfb32
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 10696 bytes
SHA-256: b0851a164b217476003ecf5c13b47bc000c527cd73a19a8043c9995763d88fcd