Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b1922e9ecb495b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 09:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0730f00e3ff53cc17dd852cb37ce96f9 SHA-1: 99ad8b9a96e10200ff91bdf812af6754fde349b8 SHA-256: e9b1922e9ecb495b0e26025baa7f9565276cf894a16ae00d42a8693b271c5568
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a primary attack vector of directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=root+xiaomi+redmi+9c PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2da427ba1b4c469380ec01ebbfc30853/zojegelufukinazuwow.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xikugekijumaratimesubem.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/15514507559.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/forijabusekitanem.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/mk1hm332hrehcvmb2030rt7sci/xubofiwuxagupijejudow.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130750828d9a---fobawinijuf.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/sereranefalejegutivitopiz.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///86207604906.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/puzenonedapuwixomu.pdfPDF link annotation
    • https://venefoil.com/ckfinder/userfiles/files/22011120868.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/78117595028.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8568ef3af3fc4f72695c99e612861905/1954194833.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/35184600063.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/55845187470.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pt408ufh73gvr04mnjivd40v50/givetazekolivutegifo.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/87444632996.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/42536702694.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/lijetusuvusejozoromiji.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b460e5585d---wodovaxu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea41601cf3---vadigopilavupagedupavip.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vudupozu.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/45426605299.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/64448660440.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/ledebiloj.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_off0000b441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB441 10528 bytes
SHA-256: 191de65f68010bb0bcf59ec36e73242a621509192c7dac1643e530fe5141a81b
font_01_sfnt_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 17520 bytes
SHA-256: 18792ff1023bcfe2521a4f7542be6266248d7a6aaac17d56a37271405b291984
font_02_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1