Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a3c0bb0818db32…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 18:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e735274950cb7816f15e1a42668f261c SHA-1: 8ba0958bbca5f789f9fa15c93b680cb8eb72a002 SHA-256: f6a3c0bb0818db326a93bef7dfaeb02eee7e329fe17ece639ce7f7662c8bdbd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=lock+icon+on+android+notification+bar PDF link annotation
    • https://rumputhijau.com/contents/files/16147109461.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/xokikitepuden.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/getiluka.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613391304190c---48092661599.pdfIn PDF document text
    • https://robodom.si/files_vsebine/78471286016.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/25254324812.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/xarikijosimu.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/nufilarut.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9dd83f8b1b1838faa8ef19e36bc37b24/kizodufafagotipugeg.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/46355651046.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/86781949129.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jlnou8qjs9s6idfcg95tecqoh0/98282537059.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/36490521760.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/fuxof.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/fupuxikomexil.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/92878572224.pdfIn PDF document text
    • http://asid.rw/userfiles/file/46174192616.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/vidigumosetudomu.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/totenomojomixefo.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/68289804396.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/5031723135.pdfIn PDF document text
    • http://origo.ws/userfiles/file/74803991546.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/povibemosudof.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/54198549087.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_off0000ba31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA31 10312 bytes
SHA-256: cba568efd879c4fc13f2908ad1f7327e1bd22cb664e7339ca7015b40b7c8f4bb
font_01_sfnt_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 15476 bytes
SHA-256: 2cac8e8fcea3ed2dfa270b57e1baa6ef6fbd5770ff678f1507472422690f41f6

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