Malicious PDF — malware analysis report

Static analysis result for SHA-256 676d411312048140…

MALICIOUS

PDF

74.4 KB Created: 2021-09-26 21:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b363fecbd7b0b5a9b7c8757d2ba24e3 SHA-1: 35b7eca7ecb51203d275c99fdc07db7f3c3e6ac9 SHA-256: 676d41131204814007839a7ebfb0c00724329468f0ce91e0d57109fc375e92b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://safe-international.com/userfiles/file/fogiweraxizipiti.pdf In PDF document text
    • http://studiopignotti.it/userfiles/files/43538836153.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mirodofuxaxoloxub.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/20441518787.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91446c32b---95910997586.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/1187464015.pdfIn PDF document text
    • http://stevis.cz/files/file/nenewagepozusujoxu.pdfIn PDF document text
    • http://teknis.it/userfiles/files/48881955728.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210916/file/16318004189880.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/rovejevamarasara.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/26884259838.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/bebarolaketipuk.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/26912204572.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/30597220884.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gupidaginobasosu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/tesitarugumite.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/59646025183.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fopewusaperiwog.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/41053592420.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/88153887403.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/sofawuxisozavapoge.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0e9a3ef4f4bc0f7a8625a955058b056b/kukikekarawenalogimetik.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e5f0adc6101fc2201beb40e81422a58/dagipajiguzexarovudemer.pdfIn PDF document text
    • https://maytuixachanquynh.kimtuong.vn/isc/public/files/fckupload/file/7071577326.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/jozabapaxesujenikeni.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/bonisovemugalezimol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=redmi+note+9+pro+free+fire+testPDF 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_off0000bc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 10664 bytes
SHA-256: 46035e5a217dff61c68991eafeef75025db687240f581f87889743c1ce44fc49
font_02_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 18220 bytes
SHA-256: c00c5c5ab5b7729fef0a64bbdb0f889722da1769ed1c4e44bc956fb15f044adc