Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a07c91739ec21b…

MALICIOUS

PDF

85.8 KB Created: 2021-08-15 15:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1c420c758af8bbcde1ac113d3d58f89 SHA-1: b39aefc38a4e78eef142227db51ea85a91c2b1e8 SHA-256: 74a07c91739ec21b60d962c93f37a248d75d6aa3a4308f5f550862f2fef91b70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=carteira+de+vacina%C3%A7%C3%A3o+pet+para+imprimir+gr%C3%A1tis PDF link annotation
    • https://kisikana.hr/UserFiles/files/zulanif.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bbfb79c9fb4474a2e1e3de188645ce0e/9190431029.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/mutodomifizusakezo.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/48484017490.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/46n3n3qdmd763065nap9tmbl36/12254723314.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fe5601e9e98f8d0c9ec2f92c9bec72b/sudisifenexuzipugovafuva.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a4a58d042bff940e82cfc1ad02efceaf/30306057540.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739420cd319---nejokujivulotupabepapino.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160838f6d7dda1---titefur.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160901c4cec5ac---bakisipazirezelupej.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d72c65a92---goradajekerudizisif.pdfIn PDF document text
    • https://ubranni.com/uploader/files/79011130820.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/81434111995.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/tufosan.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607539742031a---fagoder.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609905ce9e99a---velerekapozisiluwilat.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/vawazog.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/17977930964.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/kutamoke.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160984ff7a2885---22429863663.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4203c7fae176db47689726cc9ba070f3/nafapavasolirawabuwuni.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/596456359.pdfIn PDF document text
    • http://congtyvima.com/images/Download/fujorofi.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_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 11552 bytes
SHA-256: ec805065d2b95758e8f17b3371f41c5df5e798ed4454381db9de07da9911eed3
font_02_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 20160 bytes
SHA-256: 3f3c99f16d763dc1a1d7743569ce7c9f3533d643bb2c84556c5fd09d579fb6fd

Open this report in the interactive analyzer, or submit your own file for analysis.