Malicious PDF — malware analysis report

Static analysis result for SHA-256 78819f271775c1d9…

MALICIOUS

PDF

73.6 KB Created: 2021-06-24 09:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4c1b923a294a03e6925e985d9279a880 SHA-1: a68f4cdfc256b892f4800d83907178592974f378 SHA-256: 78819f271775c1d93c0b3bf750ae08b0bba5ca122e1dc5955baaeffeccf31e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in some URLs further supports the idea of tracking user interactions for malicious purposes.

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 https://cructi.ru/uplcv?utm_term=0114+que+banco+es PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b47ca8cbb---pazurikulosis.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/3aec8325300038e6e9ba8d908df94e8d/sagalisi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kafuxasunotegogo.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/33399531418.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/df2f694b8de0bd479800d32b1844fe3c/2527028295.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/movawonojufupedozupi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zifolagobikus.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/jajojino.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/l2t2vgubnqonktt72qft8f3ds9/tirele.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/thtj1lg3u6mdr7n6rivp72dpob/togixuxukurekepugonetedu.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/s28uo7e97nt2j3iu971dvf95b7/75178210922.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51b6bff54---kaneremobusizinor.pdfIn PDF document text
    • https://mauspro.net/upload/files/52919286355.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b876c93d542---58650868401.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602002100.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b918882e---digurimugevutupepesepa.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/78094396084.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 5116 bytes
SHA-256: 47471accaad5ed0aa2f62df568dd97e9eb1062aacc0c1e7a9dcd407068dbed34
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 12380 bytes
SHA-256: 96dbf774adf7262d6bc4dc49e29fd82f10d22df8c9d29ec94e1b4a63505655f2