Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4007e5f873e4450…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 04:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3865d169ff3f998bab9423315e2a663 SHA-1: b3723d213911cc0e8df412cef5dfe6aefbabf44d SHA-256: f4007e5f873e445069f7ec7fa2b9209a3a44d234d353c59a850db150b63ec769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine results or lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://dxczx.com/ckfinder/userfiles/files/20210730_154722.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5e777cf3c856702d826888c1c2cf97a0/64073736138.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/46803229103.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/16671250799.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/68d35c003dd49b8eaedfa496d883dd04/gosunavivutegezirazitijo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2fb6f7d39a857aedb1cf1f44292cf538/22151503121.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/97768289429.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/razukamigiziwibabivewane.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/96184854954.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0d8054590e0cd1fa9494956e50b9026f/28741109018.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b204572d6d---bozipurumi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d93747999---38090611409.pdfIn PDF document text
    • http://mesterek.net/tmp/gafigomopikeside.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/lig160i3r48rm0lnnp0chorgej/bugaxitugu.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/zuzaxixux.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/rapatime.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161170e2b48140---25291451978.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607543fbc67e9---xolisejot.pdfIn PDF document text
    • http://langmypham.com/luutru/files/kubimewozilezunemefejun.pdfIn PDF document text
    • http://vanhacollection.com/images/files/tajubotolonanegasikijexev.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/devemuzizejo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hb3ljg4q5eu68q5jvfau86rpr7/jagelokigabawetobavevi.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/45541189569.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/93803846804.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/tepakefubizotopuron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vegetables+names+in+tamil+with+pictures+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 23264 bytes
SHA-256: 0b6b7a431819bbe5dc94c6833a773c429afece4de9aa4e3deab97dec48e28214
font_02_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 11240 bytes
SHA-256: 058d9eb014d17ddb68db0ad66e88e30d5cae66447ae38f3a43d0e6db3c3fa55d
font_04_sfnt_off000136fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FC 16456 bytes
SHA-256: f716872573c63c8cc877e25377f7e74667d30cca5b427cd4f4e49682d129b310

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