Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6211bc66df72dc0…

MALICIOUS

PDF

77.7 KB Created: 2021-10-13 15:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0961f4d613a20fd2b9358db327089ea2 SHA-1: dbd5c76afc288de57dc080741db73b185aa96f46 SHA-256: f6211bc66df72dc06b8a44efafcf09d98e32dc13848883a1a89fee0b0d440297
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including one identified as a compromised WordPress upload storage, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ozsahinotocam.com/img/userfiles/file/sepirasuwimaju.pdf In PDF document text
    • https://atputasbazes.lv/images/userfiles/files/warojilubapupalomi.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/sazirokowemaku.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/98887659028.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/69069393881.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/vikelilujovesexusix.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/zukubevazeminisuru.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/juxomepifusomemezibiwaze.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/45778695273.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/vunipabimenugifadobus.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161610674d1e13---xunutebavusaridaxogogosez.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/jomosuwiwi.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/nukeziserosurowowugu.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/zixit.pdfIn PDF document text
    • http://8njl.com/userfiles/files/jugulogezeromewipiduga.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/25154914725.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/67759938009.pdfIn PDF document text
    • http://apcmagon.com/userfiles/dabogawopuvanamafumab.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/lirowisusubanirewinovubuz.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/gh57je0rv6gekmnv70srbhq0js/torolitut.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/84773777727.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/772151c0dada09afb8058fd0941e1fbc/jukiw.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/35676458400.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/89887662393.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/jivazajizusujuguxojenorus.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=what+does+the+bible+say+about+worshipPDF 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_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 10820 bytes
SHA-256: f7fa6daeb3c43aa55455945f7803c6a5f1fb1a5e37cbdcdfa523e8d8d34d281f
font_02_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 19080 bytes
SHA-256: 09dcdb9c29c78368aaca2418e798f4a8d890b8bb22fff0761ea3ee80e112a03f