Malicious PDF — malware analysis report

Static analysis result for SHA-256 18456f66f5ed1e10…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 19:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71957bc52c3e7ac706e23f4c4bec7af2 SHA-1: f946817dc0fb7d65ed6fce16480ea50b88234c7c SHA-256: 18456f66f5ed1e10ecae472245df5681e015d5ca07c25ae4f0a1745ee4de8998
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed02fbc09e---fifopa.pdf In PDF document text
    • https://ciar.vn/uploads/image/files/3228346840.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/tufofurumezu.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/44466578835.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/61525291596.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/jaruvexesawe.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/50442579129.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lefuxowufevugepipomu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/botofipipakaxidilupap.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/duwolapelurenikepirub.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/87112263642.pdfIn PDF document text
    • http://zgic.ru/!upload/files/dimagafoji.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/guzetegejupopobo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9738b8f995dad0fb1f037bfcf6516212/leziduxigifago.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/30981935933.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/79551285879.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/1182443241.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/rilumisololito.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/99975087352.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ed260cac403f138e916e3abf07ac5f95/94979630914.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/vogev.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/jjeij9vdben0sf2p23tku18tr7/42602328680.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/79408024706.pdfIn PDF document text
    • http://sial.pl/galeria/file/dawinesise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=win+7+home+32+bit+iso+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 10972 bytes
SHA-256: aa4ce80899600e3c0faf920f4f7d3146a310bc831cf9cba15cd81741f57a629a
font_01_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 23620 bytes
SHA-256: 3cf924b55fba18330ec314e16dadc021fde6fe0827e9a0fb6682d793152bbc44
font_02_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3E 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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