Malicious PDF — malware analysis report

Static analysis result for SHA-256 470a07c93f73be33…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 03:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5ef1f3118a84aedabd054475fe827ee SHA-1: 9c6dd3b6fa60e4c1e0022b13a2f66f4537aeecf2 SHA-256: 470a07c93f73be33b0c4d2f36f0a149d320a515213a265397984377262517920
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on potentially compromised or disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://mr-alian.com/upload/ckfinder/files/15892174894.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/joxamopewimivanisozi.pdfIn PDF document text
    • http://airmon.hu/images/files/49422097547.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/xorezereloxiwamo.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/59319748004.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910211155.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/tisividanolem.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/jawija.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/64643341691.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kajujur.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210902202630.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gikovade.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8c4a356c---buwedesejagalokoto.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/41815489269.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/71392705344.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/fuvebexofakuwamiv.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/6832337433.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/wupobikezolilodefa.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/xidiz.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e63fc74f7c46cc4b99f34f72e41b85ee/burazidibidegatidezite.pdfIn PDF document text
    • http://vaynhe.com/upload/files/60594975961.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/kuzobebumomakifuweberu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3a543040e2a789a401916ac02722a44a/98687227579.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/93341260084.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/24349337853.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/9158752513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=weather+channel+widget+androidPDF 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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 19340 bytes
SHA-256: 6fcaec1f49336150a100347ab7514a1a273df9f6f9156c2a2c7097f8c86621a3
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 10560 bytes
SHA-256: 537b6bea057b8f33ee498ef2fa38995c03a3bc6f8b2180115c40d947706bbf12