Malicious PDF — malware analysis report

Static analysis result for SHA-256 422cbf9bad449a70…

MALICIOUS

PDF

87.0 KB Created: 2021-07-06 15:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30fc5560116e2571f70e6903e7b0d145 SHA-1: 7deff0eb62ac01f749dc06451238fdceefefaf5c SHA-256: 422cbf9bad449a7071bbce2096d7e196e7d12b2c7d2be85f978cd8319238edac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://franzoesischebulldoggen.eu/userfiles/file/37150104602.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/978d6d1716b05453107a0182f3265538/ziloginevimoxanajar.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/23c82eb82b385ff9007d8fe5e7e39020/72583373630.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/tozonugaw.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0hflnscpreh03n0rvhjgq8rl13/jonubanezoxomunewojutebi.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/48076997044.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/88930771084.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a5d515b855f90d17b18de857229d4aaa/5023846270.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/jd83evo36hcrh8qb1ftf4huid9/bawuzubekoxel.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c3869eca4---16260571490.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/tigunawirizafeguzewaruxe.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/biwopofukutijego.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c305dde4cc538b91d2311e36e6b4340e/61980520047.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/15090348900.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/442ec86ba86ce791e203c47ae9218dc7/28275914700.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/84550033317.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c271f35215c---93858051609.pdfIn PDF document text
    • http://sport-way.ru/img/file/31824176232.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094a64bccccb---tanonavanifarip.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1f05e606---jadazokonunage.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3f9af8e9---94077617377.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210706114730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=common+interview+questions+for+civil+engineers+pdfPDF 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://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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 16980 bytes
SHA-256: 389f5b11a10ab3deb43e447b51eddefda8e3279177356024949f858c7196f452
font_01_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 11228 bytes
SHA-256: 0d2ac7d662947167f3e47dca81c9d50ac9aeb9252be31a6fa397c5be67f3fae6

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