Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5b685d86c13ee6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 18:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4254450ebbc1f31213620de86839d837 SHA-1: cd7e1f3eaf6dfb8e2215b729b04931ee052fc5e7 SHA-256: fd5b685d86c13ee68ee36d0ed817cd7a4a72769013d759c66d23a810ae440459
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a tactic of using disposable hosting for these links. While no scripts were extracted, the structure and URL distribution strongly indicate a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea54016c50---53491853694.pdf In PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/96136237083.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/vaxunewavoruxunit.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/68484254322.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jananixonuborifebowatig.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/wefamoxedasanononejibe.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/45695922131.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/revokejakame.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/67808a8a1b5f34db34a2c040dae2c5b8/sabubuxumosudivafegetew.pdfIn PDF document text
    • https://777mto.org/contents/files/zorakazigixojaf.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/34802447349.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/lubasedojogufigi.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/81967469479.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/57092391694.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219151933413668.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/27566597886.pdfIn PDF document text
    • https://invest.pl/userfiles/file/defixafepomorore.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xofijabewufek.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mq1sok0594lf666taihsq2ahav/37127123090.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/vobifafodawidaza.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/6187996046.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/95517674810.pdfIn PDF document text
    • https://spacio.hk/attachment/file/25864340697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=videobuddy+app+new+versionPDF 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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 10716 bytes
SHA-256: 106fd2e9ed5763110796c6351da016f471b5024b04b0566e772b54a4f37031f3
font_02_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 18356 bytes
SHA-256: e22f9ddde866ace4cd841b941efadabee03ea376dae3f8a39892e29ca7959a52

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