Malicious PDF — malware analysis report

Static analysis result for SHA-256 b322e9b6b48f79cd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 14:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fba322e70271a8b4d7602db7fe8a6ff SHA-1: e95732506205923ad54de07e78ec4bc56f7ca299 SHA-256: b322e9b6b48f79cda0982c6f53c8cf36c6a84dca792147a2c373acca88121e76
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The document's content, though heavily obfuscated, suggests a social engineering attempt to trick the user into installing a browser extension or update. The presence of numerous external URLs, many hosted on compromised WordPress sites, indicates a link farm designed to redirect users to malicious content or download further payloads. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chcial.ru/uplcv?utm_term=adblock+macbook+chrome PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac1c2fa6b---57964855089.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/35691530046.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/87392501270.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/61245551029.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161389b08b0ef0---38807482262.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d5fbd8e8---refimivonefuxifoxerudupuw.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/42722325796.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/69060748649.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/14015523681.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/wemudeveturalovonepe.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/dilumitatijukabiwuluvexo.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/99080315151.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/tofewowegojukafuwisebet.pdfIn PDF document text
    • http://princeverma.in/uploads/files/87748209218.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/vajipotur.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/nifofodivi.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/24605906841.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202192158451822.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/69203131353.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/fasagelokuxadopikafoxemup.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/90684772657.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/zamepuluwafumigimira.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/90454132521.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161408a8bcc791---jofiwakosex.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/70833655258.pdfIn PDF document text
    • http://logicamail.it/draft/media/2527428267.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 10388 bytes
SHA-256: 87604ca2590f052204b55d5969ba1ebe6941a9917997fee812e448eed9caa2af
font_02_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 17356 bytes
SHA-256: 8d79e4faf6683febbfa2668b3c888946b0434346e0f882d7747494aa28c755dc

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