Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedb78d7f81b02c4…

MALICIOUS

PDF

68.4 KB Created: 2021-09-02 15:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e175a300a82ead132eab514c25f0cbe0 SHA-1: 6c5ba29c4b1211842e95fd27c9453cebc346127f SHA-256: fedb78d7f81b02c4db200940ed36cae2c22aa63dc05c55f9dbda81c8c396bc6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_URI' heuristic indicate a strong intent to lead the user to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=letter+b+worksheets+for+preschool+printable PDF link annotation
    • https://total-sport.pl/img/upload/files/68392472965.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611503d41f2f8---33678344304.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/77036013355.pdfIn PDF document text
    • https://fratellifurloni.it/file/vaxirepe.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/74935819272.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/zugizopugagoxufek.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a251bb604da---24936363855.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/98593399605.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/74339552462.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/80726807435.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/14315838123.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e6ccdfd62---73909244663.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/dfi871vuofibgeacruc1igqsn5/32654558050.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/latifijewofuliru.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/55851910481.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/33652530607.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/306a458c575a5d18539e2ac124cdd133/5372273051.pdfIn PDF document text
    • https://telenovella-bg.com/files/polodixunawizolupusofabu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ou71a2fg6cp9jmr7mqm6v053l7/rosajemamutafuxokipadonid.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_off0000ace4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 10852 bytes
SHA-256: ae644e8bcf62fe3f4a85388fa9427596be4e2418dac7cb99db48a25979012a1f
font_02_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 15272 bytes
SHA-256: 9d36095fe353003d7c87234ccbdc40e961fac089a2ecdd7c6a03c2d43bcd813b