Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e026927a126665…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 10:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34c7d0a9515cc2d8f385a3f33ea60f1b SHA-1: d27dc065a5786e695ed9e2073f618c4f1b206f1a SHA-256: f3e026927a1266652b2a23a901a9656eb609aa36dac050cdc4d11e835e50696e
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing an image-only design with a click-outward action to direct users to external URLs. Multiple heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 71 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 http://king-pro.com/userfiles/files/bariturinibuf.pdf In PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/49197078357.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e929e36f5bf---98806978778.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9d2c53a2---jegenuluwidilemazewesu.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/91508716889.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/meguseredunuwozot.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/l041096dm6p7gm6abh432npkfn/jelulikeritol.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/95347645477.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/61851666691.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/32240992593.pdfIn PDF document text
    • http://whatdwellswithin.com/file/delogojujibi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966b485572a---6297570408.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606f194aacc12---2726864546.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d71939f2---mojovuwexufurorenidi.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/fikuvutamegidiwomi.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/62265404626.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5g1g683lfj393e8venq51b0ha6/41247642366.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/8733702228.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/kupivipavogogo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097607383640---69856898037.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/kezubobum.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/zetivakefatovojoxo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb289eb1b49---27409083081.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/5318994720.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070daa428edb---89317878235.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb5ba00476---79798095247.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ad32d3918f34e44be48521a74257a705/92168331529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=smooth+muscle+has+long+cylindrical+cellsPDF 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_off0000b9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AD 14420 bytes
SHA-256: 48b47815ceefd0511fbc7856294d1eeb0cea1a03f54231c22ea31d70c3e63626
font_01_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 11104 bytes
SHA-256: 2c958a6620803574a42e3c411b24b86fa6531a4339ea365036201d57509d5ea5

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