Malicious PDF — malware analysis report

Static analysis result for SHA-256 737ac624d29f8e14…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 11:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3dba4d549fb0802418620e63fa25680 SHA-1: 467a96d91821eb911ca0d2222048e9b32e3d3206 SHA-256: 737ac624d29f8e142fcd05927ea7d901df98652cbd10753087fe7572bf745ccd
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate it's a link farm on disposable hosting and potentially a compromised CMS upload. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery via these links.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://citrasas.com/ckfinder/userfiles/files/88332158465.pdf In PDF document text
    • http://iamsong.vn/uploads/files/zopadepepud.pdfIn PDF document text
    • http://zatacorp.com/upload/files/34207960268.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/28479476098.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/68845867639.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/97455515273.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/poloragisiradovanimi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j15dgj6n1h2ou877v195i0abp1/wunetelumilotelovovefu.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/91881904854.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/buvosujonini.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/katopokiworaledoxigogu.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/towolexirutadap.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395a9a98264---7945555925.pdfIn PDF document text
    • http://slovoveri.org/userfiles/70927957837.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/tivikebidurusitufixaz.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/70642014762.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e612cbf6e---69405207942.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/wuwunur.pdfIn PDF document text
    • http://pronobile.com/catalog/file/vobiriwu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/vobufulazebuzu.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/luvemowa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/77559213487.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/rugurazasejozekave.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/43168838208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=zapya+latest+versionPDF 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 18676 bytes
SHA-256: c6c37ead592bb2140231c5352dd7817f1dc2e59382c687566beefa9f67d691ea
font_01_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 10388 bytes
SHA-256: 4d5fbdd5060edecfdb5839da3ff6785c8decb39b9366153941a932b8d65cfe80

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