Malicious PDF — malware analysis report

Static analysis result for SHA-256 4823fdf8595b2533…

MALICIOUS

PDF

79.5 KB Created: 2021-08-27 09:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6270109be957852a925b95e5a6df4fb1 SHA-1: 21229b8e9060c3df1d27302f485d3f308dcc8457 SHA-256: 4823fdf8595b2533b21879bc58ff2ff542e5a9881d5359cd351505d40c899d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure suggests it's designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbfec330d---luxigamube.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/40jdcpij78kltlgt1m6f90q0cu/93017801030.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a78da5eb1119ad3f17e484b824e165a4/fuwutajanoreberivosiregu.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/93886799866.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2814d8cfdbc5222beff8d592bd8c4c71/xopava.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/46361641947.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3af70c78---tukegorolibuwo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16083021a921ab---monekugezizuvufexewigofog.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b33d6692---51951526626.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/xatezanomowagu.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/93432743257.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160777a3a29cd9---zoramaratazoriwedezo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b54c1830---dolugoxesa.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/nejozerazubovikugerosower.pdfIn PDF document text
    • https://aromamarketing.md/img/files/lumipirurajoletaxewe.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/91134280997.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/37046574451.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0vai6psm3hmvhs6kc0hltr8a21/10254860302.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/vulabuguzejakepagewavot.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6174602b---barexurikukasujufug.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kexulekazofufotatiwa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076aba824617---20878180661.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610f77719fb78---88150234902.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/23480488632.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098351e2006a---niberaku.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/wuxotefuvuxopugewore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+general+health+questionnairePDF 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_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 10596 bytes
SHA-256: 2c43c793d593837e049432012df1bccc7a21babca105dda0077ba207fd367c77
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 16132 bytes
SHA-256: b70c349efae291ca4b0ae07711712083ed20450e8adf1a01427697ceb257471f