Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91ab0b14e9c9f93…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 08:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3038e8eeac3d7b0fc7f94ad39d33c8a9 SHA-1: 74e1a9cb91bf3a507f4bb8262d15d644caa42efe SHA-256: f91ab0b14e9c9f93dce28bc268e0ccecf676de602816f3288abe734e5f15af48
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a lure for remote support tools. Although no scripts were extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to trick the user into downloading and executing a malicious payload, likely a remote access trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://1544-7419.net/upload/fckeditor/file/vezosevo.pdf In PDF document text
    • http://miyozenemeryville.com/uploads/files/gesuderi.pdfIn PDF document text
    • https://dm288.rs/slicice/file/nafekikefutorixan.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8ed563e0---zusababekibesuwosekef.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/vobawalobegogodonelet.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/juluporaj.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/80616605212.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091417161990.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134157f98e0b---3965792583.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/24458350593.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6f5939bbc7320b5c8f4de67e59e1b2a3/94612482562.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70187046574.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/41120983384.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/dedopinegibazawo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/sonetudevinabugipajelufus.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210903130737_44z3sj.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210912033714_1207210344.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/lexolozodujamawawu.pdfIn PDF document text
    • http://marymo.ru/uploads/files/10514501847.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/85420480646.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/tafiwuvew.pdfIn PDF document text
    • http://inercial.es/uploads/files/zavivevisusuxekoniw.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sunumujitus.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/54358013259.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/266753005a38a7ad8e2e8ffdc725ea7c/rosilatofodowuron.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/pafifosudujukakixodajuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=is+it+possible+to+cast+from+phone+to+laptopPDF 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_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 17372 bytes
SHA-256: 739d554864591a38dce08b91d334dfb9c8e1fa4ddb9b07d505bf293f5eb97f1d
font_01_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 10836 bytes
SHA-256: 9401bb3f445a9de97563aab839635e014222b6a4335c5b074ce83e69704e1506
font_02_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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