Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e059e1b39fe996…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 19:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6dcbbc1c76f60f0c24db33f64f838ed7 SHA-1: f1d00d70cbd54cc7922238822ce49bd620cd342d SHA-256: 45e059e1b39fe9967e0b9d10ff96acad6e8ed8124e008fd4170321e096282bed
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading malicious files. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely exploiting a vulnerability to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://krisoc.ru/uplcv?utm_term=emulator+for+low+spec+laptop PDF link annotation
    • http://buyyoutubecomments.com/ci/userfiles/files/48912698475.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/zisil.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/96649238209.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/78879735076.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f1123bedb52d0051abed1aa3dae0f489/xerugiwox.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/surikananeluj.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/nekuvadibop.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/nefepagufukuzebokebuvet.pdfIn PDF document text
    • https://oferta.lt/i/File/38396734426.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbff4ad1cc---saxutasowoduwefubibuguxu.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/lolokukimoga.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139509898c85---44878412634.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d0310a6---kepowiwowodidozek.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/josadazodaraniduz.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/mumuza.pdfIn PDF document text
    • http://topp.pl/_topp/file/sesafuzoxafitor.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/suviguxu.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/63269778593.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/37340932679.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/finokuputosetizoj.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_111937.pdfIn PDF document text
    • http://schokofontaenen.de/idata/99865576336.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/zukugifino.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85985083185.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/64104029028.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/rofopup.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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 17432 bytes
SHA-256: a1d695fa6704a5cba742151e796d8fd8cfafe553ecc7748df7ed80abd08a77fa
font_01_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 10616 bytes
SHA-256: a6f36fc96e7a696e83b60f00cd76ceab3e01fd7c3fc578a7d007b8ba497e26c1

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