Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3ac2deb068fbfc…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 13:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea3b5f6b2abd13ead99c4db4fe35b8c8 SHA-1: e739377441abde2c0232f1902f742ca6eb23395d SHA-256: bb3ac2deb068fbfccffc165f35e2cb6e8db9963b6b6b5408fd4d63a91c3f718f
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it uses an image-only lure with clickable action triggers, typical of phishing. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bruceleevideos.org/images/file/jupad.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26420cf01cc34c14c743ed5dac0efa83/74778476378.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/kebafozenebikex.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4685a5f39---9822854413.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/14674489518.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d845fc20---fatiwodedugixi.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/zuxutojojud.pdfIn PDF document text
    • http://lgassociates.in/uploads/29557326830.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/2168110372.pdfIn PDF document text
    • http://suaups.net/userfiles/file/sixafiwogepo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/milupape.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c8fa1242a0b4aed552a4bd49bf0fe76a/44761203236.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/kiwimofomumi.pdfIn PDF document text
    • http://immodraft.eu/images/architekten_agentur_images_/file/dikapatuwodobokokiru.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/32841921027.pdfIn PDF document text
    • http://tochalco.com/uploads/files/sigemekinuf.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/naxiweduzave.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/befarume.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/74816194752.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/77975633892.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/1859747265.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c88b36a39f---82165702181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=htc+wildfire+apps+android+marketPDF 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_off0000b005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB005 10948 bytes
SHA-256: 4782dd7b162b932f5f4fe55589e22d85486f0bc6a29651574798b1c8fbce6089
font_01_sfnt_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 14460 bytes
SHA-256: 546bf03283205f932e28aeecb633d217b624dd9afd949aafc42ea3f11290b3f1

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