Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18d5ef928eff361…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 22:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05cfb081b48b43e9a026bcd8f67efaca SHA-1: 53a0fa7eff91429a54158550afeb5037b91d9d2a SHA-256: c18d5ef928eff3613fe0360ba3b5d85a66a2bad2634560982fa0275c2bdaa55f
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=air+attack+hd+mod PDF link annotation
    • http://banquat.com/userfiles/files/waleraxuxezex.pdfIn PDF document text
    • https://85097781.com/upload/files/pizimufikinalarinipin.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/xaserokukalatatilaru.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/fexogelefaluremoruve.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d1ab8ae96562f22f6c67a46f2ce0f042/nagomelowezafawefema.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/65844528702.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/wikisoxisusugugox.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210918141337_1357577972.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/retaf.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/57269203585.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613836b10f9e9---wigidinipikosadoxage.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/57754093862.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/75904092074.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/5623441373.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/7597250640.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372d2e61ae2---zefepevejibelajivopejep.pdfIn PDF document text
    • http://princeverma.in/uploads/files/3974007835.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/vuvadetuled.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/tuvodeluf.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/duvab.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/nezomirefefi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kusigi.pdfIn PDF document text
    • http://czminghe.com/upload/files/71041986510.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/pewudosorolobowezegidopon.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/goneg.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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 17240 bytes
SHA-256: 8b085dc388d516dd640abf68c4fa6c6b5593b6b27d8c24b6ad335db362c08da3
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 10256 bytes
SHA-256: 92bd502ae998bf2e2f9339db076f2d39d0aa89a9d00617891005b18d91f26432

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