Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeff5ad37aa84c8b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 11:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a4bd533bfca1707b987921e4f96bec3 SHA-1: 821a4ba8e02f1d72afb1e00ae945aebdef09885a SHA-256: eeff5ad37aa84c8bf90c3bea9e3faf74c966d3b2b117d7eceafbfce08c01c019
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crewmak.ru/uplcv?utm_term=iphone+lock+screen+moving PDF link annotation
    • http://changjiujz.com/uploads/files/202109131135417512.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4612d443f30746e529a4798961036b03/56153854422.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109082145064875.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161346fa22f289---sigufubizuwefu.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gilaf.pdfIn PDF document text
    • http://kite-surf.sk/files/51318189143.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/dusoxepaveliji.pdfIn PDF document text
    • http://dytac.hk/userfiles/rewivimemaniwupoxef.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/17855293071.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/fevodujol.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/nibutekel.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210912005228.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/9542574291.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98a4a96c1---ripulujis.pdfIn PDF document text
    • https://kultmotor.hu/images/files/55894438054.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210913101135.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/371264d10afea1947cbb4c8f06d704ff/koronup.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/62854589297.pdfIn PDF document text
    • http://rc-modeller.se/images/file///45967745899.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021951714213714.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/porisugemelaretepopijenob.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/powiwaliledasadireziwiku.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/tanurorupuzefenider.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/lorojikikawomonolevupixo.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/fudipapi.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/sevugututezegevi.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_off0000c505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC505 10668 bytes
SHA-256: 7cd7e12e20390b561172520662016ca30d5e617c09ac6688cba9be5650fe86fd
font_01_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 16668 bytes
SHA-256: a743b651beb1e4b49c5b4b9f357d6d34295db2797dac2ccf56e812dc4ab94a7b
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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