Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f0dd013aa22557…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 09:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac8a80dd832b4988c75555c7fd0666ac SHA-1: 8e3674735fd8809daea9be6b3d2b7e04f19b71a1 SHA-256: 01f0dd013aa225571e4d8b62fbf73711df909dcd094f45ca6833ef4aef17a12e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to distribute further malware. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://benqmusicworkshop.com/fupload/file/tutof.pdf In PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/33216709729.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/4918977629.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1963576067---72867839769.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/96605962397.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/89125991899.pdfIn PDF document text
    • https://atl-50.com/files/file/nalobo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/mabagu.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/zejazulujoxit.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15df7aa342---wamukobofofovuxigem.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/278dc6cf791594ba9b1bcb436e2ed2c8/99967307555.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/65500983733.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/52a855a2669f4c9b65164086f7b8178a/74069813166.pdfIn PDF document text
    • https://saam.vn/images/content/file/17068482244.pdfIn PDF document text
    • http://apple888.vn/luutru/files/49718645707.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/9a04bed91ecfff75b37f0eeca2da1d1a/87075160947.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/1627847299869115434.pdfIn PDF document text
    • http://fitviewer.de/files/file/venasevalanoxekawadasad.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce839782044---kenelumoxowijepitamako.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216111147168762.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zanegenetez.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/riwisiroliwebabiva.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210602170255.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/mobejirilub.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/86699e08da859bff68cf0d4fa770dcc1/97262858462.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9c13d526---35944242825.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc9c65b55---nelimozewike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tatalaksana+impetigo+krustosa+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_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10996 bytes
SHA-256: 7b1071f036aa7eb95d8da05fc94e5653cf5aaec974918f777f2b13e633f9fe40
font_01_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 16956 bytes
SHA-256: 02b35b104cd45c30a1cb86a762a1f51e3b14871f6a8145a30b5956ee25eae1da

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