Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59e24ede8c96b55…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 12:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0a3c74874cd1009a4677689aa401cd5 SHA-1: 223272650781bfc35412caac5956487635f14991 SHA-256: d59e24ede8c96b556946a9c63833fbc2c3367e4c36257d93d1356328b90dbe9c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://synerhu.ru/uplcv?utm_term=living+in+a+globalizing+world+textbook PDF link annotation
    • http://nhasachthunam.com/upload/files/13777397743.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2126adca5---73961688075.pdfIn PDF document text
    • http://rjt1.org/upload/files/97959504180.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc36ea057---rezupiluzupepabitalada.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/papakaxozejukuw.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/venokewuj.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/wajemovulisijetaximonav.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/zevazilemagazitigomir.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/95661472875.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132542f35f57---23952783387.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/92997761397.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161409d0d81cbc---wabukolijamolupam.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/30462431977.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c99c433e---48497827050.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/80171292452.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/66422629317.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d824002f766a098f093cdca77cf47982/fusolekexumonelozukiwaw.pdfIn PDF document text
    • http://kasargod.net/uploads/file/90879569021.pdfIn PDF document text
    • https://e-room.co/userfiles/file/wifagilelujumibip.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/59479557546.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/wifivapina.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/fodukumudavepu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/125375084aea7aaedc96867a9a767c2c/kakobofa.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79746079773.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/fotikulipepolenu.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_off0000c788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 16660 bytes
SHA-256: f52d64bae6941f8b58fafcb9144fb52aad8c467e447ad8099d6bba497cb46917
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 10756 bytes
SHA-256: eda7bafbd99ecd2c30cb8b6f8737085407b420de2beae2ec84e917863347a3c6
font_02_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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