Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7d56222947fb98…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 17:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c1e9b8e1d1e3cc7045ec9827e13e33f SHA-1: daf7bb500472f1dfd4ec5239bf82b7273a24114f SHA-256: cf7d56222947fb98223a7ccc40e057ae5beb42c505f3137ce4983305fb8e7945
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple websites, some of which appear to be compromised WordPress installations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of numerous links suggests a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://batiment-tunisie.com/userfiles/file/68461600551.pdf In PDF document text
    • http://asia-test.informacittadino.net/media/files/13497947881.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/pibozomamifuriloboxete.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/novusofiriju.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/dopabike.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/nuvafoxatoket.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/puvopujejarul.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/69333720943.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496538ac089---25942895089.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/93599399596.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910181659.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/49376434123.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/pobepik.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40ad1e7be---60714726995.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416fb15e7c3---gazenekigedowaxin.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/lidodotebunatup.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/menatotusewojun.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/fejegubabiwuzid.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/xopipolak.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/tidijazogedezovijizo.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/44920897834.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bozafetatoxarugikatudupi.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/vofesuxupasuna.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/genuwudokowazizavuru.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dfd182544613dcaaf78a3b56841cf093/kulawuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+screen+lock+optionsPDF 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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 10416 bytes
SHA-256: 624d4ced02a5a63d6b076ed74686a956c60495e0a887a0dee48c4a475fbf721b
font_02_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 17616 bytes
SHA-256: ffdadfdd84a9913258700d80dc166896afd83b418be8a0a08cedcb3d4c6b06cc