Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3cda8cb3f5eecf…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 23:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59bb97f2d4ea1a34822d3e2558a7d56c SHA-1: df130f12bb823611a3f8e89ad74c6d1fe74f48e9 SHA-256: af3cda8cb3f5eecfb5cccf042be8613baed858ca4c6b4c86641ecf0911a6b104
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161052d3855d6b---6788974924.pdf In PDF document text
    • http://smartvoicecom.com/userfiles/88003139739.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/bafufo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/16071339787.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a6ceba26264d1d1073ef0907599b99a8/povugoxozarewan.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9cb5a964---34733049747.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/623b4d24db54979e62aed332c0260c50/geralob.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/fufef.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514105339_1277770413.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16127feaae7948---27699481618.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/18211593353.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760dbcbce49---76928427721.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/xakolidenafipage.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110ade81a2fc---77956125825.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/43e39641a217e6b219b72b6d5ac8c1f7/50424680302.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/16279497223.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/nojofovotivimusune.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/3182608788.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/26226864415.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210624_8BD7573754EBDDBC.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/vifiwufejujukus.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/kufokazemobal.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607335f91c690---88300607618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=basic+english+grammar+book+for+beginners+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_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 11256 bytes
SHA-256: 3f66911175dea640ba2434acdd7badc0d2fc01701cfa97493cf0a198fcdd93fa
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 17136 bytes
SHA-256: adfd4d67d95b0108d96e2009cfd77558d07bd9d0c3e3852b6443c8d373720aba
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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