Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dbff2c79f4d99b…

MALICIOUS

PDF

110.1 KB Created: 2021-07-03 05:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb1091fac6feae07fffe782f5731595d SHA-1: 3aa306692fbe51e0be524e0261d270c9425c55e1 SHA-256: 20dbff2c79f4d99bb7d2389bb04a023eaf397aaf0e6c995488e1b859515304fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains, indicative of phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=dua+for+protection+from+animals PDF link annotation
    • https://cicadit.ro/UserFiles/file/mavewigotazuvovomemo.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/57008483369.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/baecdfff92b711901341c5ff343b2c4a/mojemofir.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/41518909209.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9d32407d97b84d2dfb3a9d159d45d109/83269254570.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/zijugemebedu.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/22422851049.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607228e924b82---gegezazipumemupa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7025c1c5d---lulelevologobawita.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/bikumodozosedepa.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/pf01cvelfkm57tln65cbrmtf18/33273996068.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62428a95c---woseduxovefopewoxawapi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89229a6fa---mobapibafoteteb.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608221f5a2a6a---fepevel.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a21979e3---29550202447.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083db752f268---sukokikizal.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/nisironufenufemosiloze.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/40226590875.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/89819633246.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a50295e29cf---13366455579.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/17410057199.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/613d1255636b15392a1a4c4056a93d8f/metapiden.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014b13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14B13 26260 bytes
SHA-256: 5879c38caa8c35e73477efa1ae4f2b8ae0af6d7dd9ac39e97f1da2140068d2d5
font_00_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 10740 bytes
SHA-256: ca0deaf9e3fdaa9eb1aa63a364f78c391686bc5a4d902a43805e5e9ac803a567
font_01_sfnt_off00013302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFD 18252 bytes
SHA-256: a7d2136ba54012a782727f3116e2e53dcbbf980a3c02e18af7c9849a9ef53cea

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