Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb8f05fcb48c818…

MALICIOUS

PDF

70.5 KB Created: 2021-09-21 02:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8f9b8d1d07cde60d92e0fc4fa1fab7f SHA-1: 5a4eaf62e894fc9d21b8faba60ff37d5fc988628 SHA-256: 3bb8f05fcb48c8185a9d3c272328d6c06b0eca4dc5c70ea336ba21dd8aa9dfb0
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous links to external sites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document also contains instructions to disable security software and a lure for MFA or one-time codes, indicating a phishing or credential harvesting attempt. No scripts were extracted, but the overall structure and heuristics point to a malicious phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://drafthe.ru/uplcv?utm_term=ems+post+tracking+india PDF link annotation
    • https://hebatkeren88.com/contents/files/39499651498.pdfIn PDF document text
    • https://membermimpi.com/contents/files/tubekumesavapirokajudix.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xagolaxipurosot.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142098662c94---29703208814.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a77caed89---51820995325.pdfIn PDF document text
    • http://technocom.pl/editor/file/19355436296.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/81568938113.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210902015209.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/79401855930.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/94479136575.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/83801721277.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/79474734353.pdfIn PDF document text
    • http://446888.top/userfiles/file/24423528555.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xusodezuvolavewulerosawi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ffc7a9e---65487031940.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6596a69---divemebub.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/43170941785.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/66055076118.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/kowuzoxezedosom.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/43482972423.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/besozogukujoxuxosezux.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/58978176993.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/pukoxejujanadolop.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/9217958795.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/23834125990.pdfIn PDF document text
    • 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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 15392 bytes
SHA-256: 7730d3aaa12d36ea36f89176372b35cc4159833b275702cc6bd046897484e83e
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 10756 bytes
SHA-256: 2f211c13ce2cf16df9cbe83febb512af9e88bffc85f01e72b2581faa86f2bae8
font_02_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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