Malicious PDF — malware analysis report

Static analysis result for SHA-256 54af6564ce0ed5dd…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 14:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9810cea370ea7c2717530a91105abc1f SHA-1: 339511f613757414010d31b82cb20dadabe462f5 SHA-256: 54af6564ce0ed5dda728eba34a4a75c61a210fcc3876ac5415efc6bfb5eb3471
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8b01eb85eb23361c4bfce0158f2bec88/bovujufiwazaxuz.pdf
    • http://libertyquad72.fr/userfiles/file/jezowefarojipedajeta.pdf
    • http://www.primariasantana.ro/uploads/file/68916347473.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/winekutiguzi.pdf
    • https://keyword-lda.pt/site/upload/file/61831765016.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/16e4a41fbfe5e82b1b50ed025d7dadc8/lazexipogejoto.pdf
    • https://pisangmanis.com/contents/files/58519317720.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/67835906622.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b710742af---geponamuj.pdf
    • http://yuc-fac.com/uploadfiles/20210905195235.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/19291801005.pdf
    • http://fishtech.org/uploads/userfiles/file/file/99354965324.pdf
    • https://edusfera.pl/upload/file/46103136011.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/72719488016.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/65051042975.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614144c6a91b9---tosogisajud.pdf
    • http://canadianrockies.ca/files/file/bedimakijufagoxuxuwokuzem.pdf
    • http://changrung.com/ckfinder/userfiles/files/62000315593.pdf
    • http://kfnmdg.com/upfolder/e/files/20210913141246.pdf
    • http://ippinnudon.com/uploads/files/banonapexesivof.pdf
    • http://a-kamen.com/userfiles/file/87723270336.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+cast+android+to+firestick
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 16792 bytes
font_01_sfnt_off0000f7a2.bin
dddf971ec2456442382dfbf0b0c16ba7506103dc1fc5022142c9e024f0cc04d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10592 bytes
font_02_sfnt_off00010ff8.bin
ab6c264dc6a900a35ed0b8104c13ad414c4f31a181b4b03171b8ccc96b19bcf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 18120 bytes