Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e546d27c975657…

MALICIOUS

PDF

77.5 KB Created: 2021-09-21 00:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8833bf02a787fabf026aef7aaf67a196 SHA-1: 94663dae8a9b6de844ff84eb41ee3e1e084c297e SHA-256: d0e546d27c97565743e097854a38e925d953a1e3e6043d78a838a1764b4e9263
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites and disposable domains, likely intended to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights its nature as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anhuifan.com/upload_fck/file/2021-9-4/20210904223427862275.pdf In PDF document text
    • http://synphabase.ch/upload/file/lunalivuxeteno.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfd9ba7c---20633629169.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/16593136910.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143c4a98f318---bavufabudikofupom.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/54300330705.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/94488769839.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148585d44e80---38837927369.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/togim.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/maxezidurudokizepajum.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/36454766382.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/42921464340.pdfIn PDF document text
    • https://empresa-venta.hr/files/87461509380.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/vapagoxi.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/zetazidej.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/1528316121.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f986108311---widanepotiwite.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/89874245191.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/80290116099.pdfIn PDF document text
    • http://ccadl.com/files/20210913234348.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/naliwabela.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/14473186319.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/pepipuwom.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/ritonis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+unbound+rom+hackPDF 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_off0000c6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AF 10564 bytes
SHA-256: 82d861a2f5d53ca1996dc2fbaced9851fa80e03a56265965ffaf8fbcc089926a
font_01_sfnt_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 19028 bytes
SHA-256: 521d7c6775b7d96faf9b42d0009a087b37af12ef39fbce4a9867fdd851ff4d48
font_02_sfnt_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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