Malicious PDF — malware analysis report

Static analysis result for SHA-256 61eb06237e3e3ca3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 00:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 48e1e0061c23b8f74004b22e16cbcacf SHA-1: da665d28b33cce22082a66a555e39da79cdb2017 SHA-256: 61eb06237e3e3ca3c876c44ff99720f2c1a37d420034147941fc4d6c95b20f5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. Although no scripts were explicitly extracted, the nature of the links and the 'ML_NYX_PDF_MALICIOUS' firing suggest potential for JavaScript exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ketchas.ru/uplcv?utm_term=emular+aplicativos+android+no+pc PDF link annotation
    • http://clingac.es/d/files/31831786243.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/95980184978.pdfIn PDF document text
    • http://anindecor.pl/files/file/folajosurewu.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/kitikudodigopoxi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c69b206e4---lilubufufutaf.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/97724734610.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/50859552223.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/27422101538.pdfIn PDF document text
    • http://nfc.soo.jp/file/niseluximijatofuzeje.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/rerozeboparufuf.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/wopetaduratuwar.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/zuvif.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/gekonuvukuzego.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e370fab8---sakimiremerekawiwegejepa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tvtrhb2qekpbgauuhi2c3o7opr/fujeno.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/7595137657.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/jukefomaberafobegu.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/pixikutozanuzijilifidabu.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210913233513.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/davolilaxuxegifimetap.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140126cacfa5---wegobuwepefalupiwig.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/10106479106.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/38590974135.pdfIn PDF document text
    • http://elitacasa.it/images/file/levudubulumutojifaxib.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/venerubarefojimuzo.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/99084350060.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 17872 bytes
SHA-256: fc52ff39c2391b9723d39710b5047bdc89a8128521e1882465adab82d32f3da5
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 10692 bytes
SHA-256: a483e022b4c6ae71a421068ef4e992414acc60cbf0295d66840fc5b196f3a54e
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1