Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f8c2cbacb94c47…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a792652e53c9f351733342b25605e312 SHA-1: e2092f4eabe873e0348192a8998bb57fd097c73d SHA-256: 06f8c2cbacb94c47a2e42884e791d4c66ed75e673fe1f107ba49bbf4957f76ce
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into downloading further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://pinpointfeedtech.com/ckfinder/userfiles/files/94465894883.pdf In PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/lodizajexosekige.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bagepuzike.pdfIn PDF document text
    • http://xfswchem.com/upload/files/53705416947.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/gewatelejun.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/25809444704.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/loginenuso.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/edc6dde0c73187a0cb21c76ba82bd5c5/disujumajanezipun.pdfIn PDF document text
    • http://terrietanaka.com/library/files/76674627946.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/95894224656.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/784f86e3227702259740851245824b49/42892443683.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/15372829950.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/17998996349.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b025b2da0bd---fetuzus.pdfIn PDF document text
    • http://artospace.com/pics/file/zalegifitigafaselaxibeju.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607324d5ae4a2---91102548817.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/96793060172.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/nipezomo.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/wegonibidositibarafexuvo.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vuvafa.pdfIn PDF document text
    • http://metallpress.info/files/kajuxodazabidedujejipumar.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160adc016356ca---fujitafafoger.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16109c5203aef7---kenukebudenuxawilowalesix.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/wupimeg.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/49951262529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=harvest+moon+light+of+hope+walkthrough+pdfPDF 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_off0000bce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE1 11280 bytes
SHA-256: ab36ec9f0c5859a17994877fa8d1a38958f9fd1639dcacc2c372cba188d7a139
font_01_sfnt_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16372 bytes
SHA-256: 004a9e34c5f7d3089b907aa9dced7788274c052a606860bb746886c2c5c980e3