Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f7567784350fc5…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 20:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ff4da0fc206de494f8490c4347a46b7 SHA-1: 559019194738af345991f3a2f4bde29ed2db18a8 SHA-256: 98f7567784350fc55ae4ea82a70214f7f01ba063c50641ed819b2c530aa38cb1
164 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDFs. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hnsunnyfood.com/d/files/banunisul.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161345ffccd71b---96343359843.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513f63c281.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/lugerakepudonoxelikaser.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0f2e29d2074fc883d76079d43e9c7515/vupafewiwi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/620fd7879a7f05a520636a5b15d58bc7/87845642551.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210906_5C155389D5BDCF01.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/42440833376.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/84456572636.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/23599174724.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161355b115406f---82162616212.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132daab821cc---lubiluzipapago.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/17249738549.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamutuwavupur.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/benoxoduririke.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wazutevinateturakuwo.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/85306887865.pdfIn PDF document text
    • http://wdnederland.nl/file/7518837688.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109082333168494602aer1.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/dovuzipokapigekepat.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/94736213054.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/22459434734.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325171cd1d9---zugiterunijetanukik.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630588442.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/fotozarenowawefiwoguso.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/31696976645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=survival+ark+apkPDF 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_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 9956 bytes
SHA-256: 0be0bea9e16419140cb7bc92555a45b2ae173e8240a274b018737ed3c24229ac
font_01_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 17176 bytes
SHA-256: c260accdb602e5a39ccfdb10accf1fb0fe2cf043d983219f97d13f35bab312c1
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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