Malicious PDF — malware analysis report

Static analysis result for SHA-256 26995acaf5ef0996…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 16:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6a5fb3606d3956de8108fc492cdba0b SHA-1: 90570f6256c686211d76172f49bd988946b31868 SHA-256: 26995acaf5ef0996ce6ece4361616404fb76a6bffd315220d86f8cc6a1a729de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download files from compromised WordPress upload directories. The presence of a 'download button' lure further supports the phishing attempt. No scripts were extracted, but the overall structure and URL findings point to a phishing campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ab30184a---30268950057.pdf In PDF document text
    • http://stavclearing.ru/upload/files/fabinudubidapepej.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/somipidafufobi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091607042586.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/89498387716.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/sifawigemovelorimigupejoj.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/55187948326.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/3815714066.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a278543a8d---94231223880.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971530173550.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/wuximajis.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/nowodikomividufesogoj.pdfIn PDF document text
    • http://shamayachts.com/upload/file/41138670203.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/demezolefokovi.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/87583249956.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b26b68eff0---77387592911.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/40102697634.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/gupukajovovatizupoluseso.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/77307424393.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/wozuxizixuvokodisugu.pdfIn PDF document text
    • https://dcimx.com/files/3663860485.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/vekorojadiladowukugigin.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/62552924231.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/logobawakive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cake+shop+2+for+androidPDF 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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 17188 bytes
SHA-256: f1fd4d3d7b26b6810dfbb68714bacf4c446fec03af8632bf0b0777da85ffe47c
font_01_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 10696 bytes
SHA-256: fb0267cdbe891b730d74ac486cff08082a84f403b5c911f7d4d90d41558376ce
font_02_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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