Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd81d528da5db86…

MALICIOUS

PDF

73.5 KB Created: 2021-08-28 05:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3091ec8ee7375c0a87df06b594f93493 SHA-1: 2a124c932cc3ea8fb20b51e79aa7a12080cc4d0d SHA-256: efd81d528da5db86ba17fcec86fc0d0dcfbcea6b90a0b44b1ea7388efb79a639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sumbulefendiegitimvakfi.com/resimler/files/85163265383.pdf In PDF document text
    • http://instant-image.net/UserFiles/Site/File/talifiguxadaru.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/fipegaxet.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/978a13e70ac95b02de3d2f20d1968729/sivorawuzetaporik.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/97974030228.pdfIn PDF document text
    • https://peterdegendt.be/file/23928003131.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/22k9bfoqqh33orlip3cppgiefn/69581705114.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840af93a80e---koxapoxatozerodasenaguwav.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/78625514304.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/91a9ac2d63db7cf1e8614167f7b76622/zaduvop.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/tolipiku.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/30818728702.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/80764533682.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/dc05c40043da8a9687fce0a4cea06ad7/94357419164.pdfIn PDF document text
    • https://emenu.hu/editor_up/moropovejibaposoli.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/60bn37m9t4ho46952fg5dr3icm/53056876577.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/68176136570.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/wagerofawado.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd613485fb---17485868691.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/bipalitejavego.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb9984021---15152569075.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083281ef1b86---wovunukewivaluribalepi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609748a8e4454---71423297561.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/20999762626.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9ffadc235c957a521b6faa6feec54613/xetomekonogibusufox.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8b9e2c69---58160726461.pdfIn PDF document text
    • http://jinyezi.cn/upload/vexovovug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lower+seymour+conservation+reservePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 10668 bytes
SHA-256: da00204677c676e0838cc2eb468c66830706186892516f54c821fc1e4471a697
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 15180 bytes
SHA-256: 85b00528101ddf00d07047e6a86a80f1201f1bfad54f8fbd886f48c948b3e7db

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