Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea245b762389b36…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 13:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfc9f8065b7b1ad6ba612acde1cb6c8c SHA-1: 680fd437e658716d9a5fb41b0bbeee54b1b5ce51 SHA-256: dea245b762389b36b55596a2811dd181fdba6c87fae3fc110ca15a1a91462155
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The presence of these links suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://grupposcorcia.it/userfiles/files/22563291152.pdf In PDF document text
    • http://theloanwala.com/userfiles/file/84415974740.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130123643bc7---linivunufatifaxoletoru.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/41866549565.pdfIn PDF document text
    • https://ms01bet.com/contents/files/54753293524.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/xijiki.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/31791004205.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/589307039.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/8627688001.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/17278804187.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/620d345f0b850be5ae7f6504e5b4b290/kukelevaredev.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/40382503645.pdfIn PDF document text
    • http://offerparts.com/upload/files/39581602657.pdfIn PDF document text
    • https://theurbanthinktank.com/files/losumuxu.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/tazevegufumerukex.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/39448542928.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/308fcb7a58366ac4869b3f7d25ae7482/77242654574.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/31787877487.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbbbc51cd---99592961790.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613004adcc0a1---99522235353.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/depug.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/xafexatubiwatijogil.pdfIn PDF document text
    • http://trieuduong.com/images/Download/35415374126.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/82579908782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=video+messenger+for+androidPDF 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_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 10524 bytes
SHA-256: 1a0779760526aab47f626a6e2715d6ac6c74af36d1016f89a40172e0d67d2695
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 17220 bytes
SHA-256: 4e7809478665a1ef52b32540e5e8fd0dddd5a6b52df18455baf4820428caaf8a
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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