Malicious PDF — malware analysis report

Static analysis result for SHA-256 61411f38a74c82ad…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 07:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07db1c8a39a5643fd398b1a77b8fd50c SHA-1: c0111f538664b9ac59ef65b4714887e55c285a38 SHA-256: 61411f38a74c82ade59b09cdcf3f8d525403bb263d0a90bb519025e0fc90125d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the PDF format itself often implies the potential for JavaScript execution or exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=chetan+bhagat+one+night+at+the+call+centre+pdf PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613743dc89e2b---saramevup.pdfIn PDF document text
    • https://venus-forever.com/image/files/kogudabirozukiteve.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/40981690192.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613406317faf8---gafemuxofa.pdfIn PDF document text
    • http://floramarble.com/uploads/17688089769.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109051220114490.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/87027898228.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/26014614697.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/bamibabuxulavuk.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/16470363961.pdfIn PDF document text
    • https://suncables.co/images/file/dudevukexinigabo.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/66936758398.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/kopogaxutake.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/lerefuse.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/9994385624.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/xavetatoradipofezu.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/kupijubuxedinazofadekaru.pdfPDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d4f361eb6---jekuwezosenulopipegoda.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/86974143981.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/66897774638.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/lonop.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/dedevarujokuselosewip.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/21910650446.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338f4f70f6f---patifupijawosesajufe.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_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 10904 bytes
SHA-256: a80c664c50190bbff5444bdddbf5f893f07e541121e4c4edc6deb11076b9576f
font_02_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 18960 bytes
SHA-256: 279c89c16600f2240d5d30ecbeb571593025fa7c91f4ee644c118950d73eab14

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