Malicious PDF — malware analysis report

Static analysis result for SHA-256 773d57ee0944dc39…

MALICIOUS

PDF

83.9 KB Created: 2021-07-04 11:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2a1fbffa9df64b7b61a70cabac548c4d SHA-1: 8c601c0e0276b54d988a8187db8a8570a6b8e816 SHA-256: 773d57ee0944dc3916536f55d3f92f43f89a92f5222e3c4eb9caef2fd77684b0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting suggests a tactic to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://catamma.ru/uplcv?utm_term=in+a+neat+little+town+they+call+belfast PDF link annotation
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c864cd283a7---wuduwabinises.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/vomumiguvanokixidanaj.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/72007653899.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/feb77bb49408933cd938212b9ed18948/70596102966.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/zatunatizixifolirive.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/nolegekimepeku.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4atndijebedvnhc16s6hbg31b1/23458647106.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc083b5e8---xozobenasuk.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6cb93d4eb4cf8df35ebe35cebcfe0220/57680834148.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/figusoweronipugo.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dc768d7c3fe6694773ae193c86223ab/87679559539.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zajotegopa.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b23b676bf7e2eab26fc9e4e3f7cad5bc/putidinevazig.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/bezubatumi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9899687508cec888df22f2321a810f86/26009550839.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/wokumekedab.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/45167336795.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/8vfpvd49drtjo4cedor1f1mk90/32457135601.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6bda3196e---wupibip.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/90853139705.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bde77b9e728---xojizaruxigaziziru.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160dc172872aec---sudaselixo.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/nuwome.pdfIn PDF document text
    • https://bnovum.hu/downloads/relibofafobikawo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 10624 bytes
SHA-256: c2f1294c0c6f6510db0e8c602a86cff283e683edc8ade7c59f370ddaa7aa6734
font_03_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 16516 bytes
SHA-256: b73f6c7092fe382711d3c2900ee7442a6725eb7fcca255c24174e226abd371c8

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