Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79606edc3afd34…

MALICIOUS

PDF

73.9 KB Created: 2021-06-23 20:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 92411507a8f443cbb6043ac50ede6bfa SHA-1: dd483dbfe651d1844f575f5d2704341ba655b30d SHA-256: da79606edc3afd341a377166666a78e0ed51673b29530c4555437fd9320ff524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The embedded content, though heavily obfuscated, hints at JavaScript, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The primary goal appears to be directing users to malicious sites under the guise of a technical tutorial.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://gyobel.itpublic/file/28410635592.pdf In PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8d1304ef---juwajofepasavafozetoju.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/bunalulugutunop.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/vedizumasasile.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a01367f2c8a---13722971031.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/kejofalilodojuno.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/bideliwifipimazozo.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7de1772bf---dokazotawijiridumu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5e1831ad---97157410874.pdfIn PDF document text
    • https://egca.fr/userfiles/file/midovepigopelutapa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a233e556ce6---10929945080.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e124de05960acff42a8df3895e388501/52011226012.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/jd170a6c1j9qhgcihkmm1otkhn/tesejipovigifasudef.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/9d07ff7e217b8997b2edd606f562a09f/30477601487.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0dc7a61b0dac05a6bccd57866cfc0fe2/40384707619.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nutofuwuxe.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/50772985526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+snake+in+javascriptPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 5300 bytes
SHA-256: 66c123abee24bbe6eadf736c9ba134e348d2c6079f71e8dfb3853397a90a7ec0
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 11512 bytes
SHA-256: 44190f514ae588d25918949c216a17db006bf1377eeb0f8d19e4d704806ea017