Malicious PDF — malware analysis report

Static analysis result for SHA-256 19846e9b74aeb74d…

MALICIOUS

PDF

86.2 KB Created: 2021-07-03 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2b719a8a9946cd5135f1de8ca190e725 SHA-1: 0a78d88398f125d10e46282152ac70b33a2cd2da SHA-256: 19846e9b74aeb74da78781607cf50a5557374affb02ed7e0eba06b5ad2554030
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The primary attack pattern involves luring users through a malicious attachment to click on these links, which likely lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://baaningdoi.com/file_media/file_image/file/susago.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/980e61992cb81f1b7c15e771cfd110db/57916732533.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/31320825786.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16076de46d6d98---jefirevizorokumoxikizavam.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/gaseboxegawoki.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/35420542311.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/87202099265.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0n76c14r656kg8gu8ejtqd8c22/muvaxama.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-17/20210617222448496231.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/74394e7c53d5ad0990f82dbde9290537/zusoforezupi.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/lezuxebixarupim.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/95534871103.pdfIn PDF document text
    • http://cocoal.com/uploads/file/liruxunimirusiw.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801383c6cfa---84137598610.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cfd2bcd94---bidigaxiparedu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/53370c5a348c6c8957215a2fddcdcd69/xosuwujewe.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/86705592978.pdfIn PDF document text
    • https://abeess.com/userfiles/file/87220574465.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/43736891164.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/60704780228.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4c38668f---2208173100.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb79bf37c---wiwibavabujuverovenave.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a323c85390---moxepuramomeruxilo.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c143c76b0f---11473448908.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c9f9496940aec9ac112919d44d3a2188/vujimelur.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b024728d4---29722931208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=movie+visual+puns+puzzle+answersPDF 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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 18388 bytes
SHA-256: 7828dc5f0aff1cef1660fcaa6c69310972ff9d60198ec8ad6cd037e611bb119a
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 10452 bytes
SHA-256: e96832f1686fe434cb0f50258b2e37c737f64eecce3bf4a64814db263ab67501

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