Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6241b36214c2ba…

MALICIOUS

PDF

97.4 KB Created: 2021-08-13 16:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41375fa48f3f77fda6eeda94edd5c7a8 SHA-1: c2e9922705141e301503f899239fc22c350fa5ee SHA-256: 3c6241b36214c2baa6c8049f1e6cf80e492f1d1dcd9c7e5d485cb69400615420
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=carrom+disc+pool+mod+apk+download+latest+version+4.0.0 PDF link annotation
    • http://buffagiuseppeinfissi.com/userfiles/files/83642553601.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/6063026645.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/18215863962.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db619209cdb---zuxogafiwogivikusajo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982e8dc02a0---jiladoloxarupo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16108628c9be43---manejezuxoxodetunoro.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/65229764551.pdfIn PDF document text
    • http://chinalabware.ru/d/files/22243096087.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/nagidijuke.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/24d55acfa63d71a12b5f93aa62a4b523/nopiwiwonekavexojajusu.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210731092827_1828157692.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b14f8b9761---xopekizopavamofovinanekez.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/puwetibimarupixevazoxux.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/minolas.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160913a3841eac---67857792914.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82c8b2d9b---xiraferepazajoparoru.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/direrawezil.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/bojumewo.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/bafabarezire.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0ce8fd70d779421d08d41821e6d974da/riwisiderasivagabataveta.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/vinudoronilubulut.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/babodekimig.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/61629351634.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/39f575280c6bca9729fd30a41736e2ab/46258135336.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/kipevufamuzed.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 16776 bytes
SHA-256: e38fa50276b7c86e71d829791efd9adaee0f0c4e8915f1acf04b7412159af954
font_01_sfnt_off00013a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 11216 bytes
SHA-256: ca9f4e084348d8da74b005696a71a1581d59608cf2b676a4aa3758b695794cbd
font_02_sfnt_off000154c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCD 2188 bytes
SHA-256: d11e5838b64f8f98fe8ee0a18429dab24f2687fb9a6e76bf5ce60ea67486c9e2

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