Malicious PDF — malware analysis report

Static analysis result for SHA-256 62001f9aa48bed6f…

MALICIOUS

PDF

90.6 KB Created: 2021-09-15 13:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdeb2eba930fba11e294243aae7642c6 SHA-1: 16e7fd2ce2a30d7bc9b4f3471423c8212ff1cce4 SHA-256: 62001f9aa48bed6fa7f7ed183250e89080cfe1d2d5eda243d86eb5d564f5eb69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=gtav+apk+obb PDF link annotation
    • http://julianina.dk/upload/file/pokekolelunik.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ace9af60---20894066266.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/galavavuxifofotibaweraja.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/51289097668.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/xiwejuborubuwusip.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/guxewavivakejobefimas.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/peradizolaz.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/98358442115.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/sejazafuneg.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/3fc3302edcce58aecb3a1ecedc8588f3/tudewaruxefetugagako.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136213a1cb82---resugikiluvelat.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/46068672998.pdfIn PDF document text
    • https://badoza.net/userfiles/file/pusakato.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/bekibitajud.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/64808143474.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/sazupifupawowotozaxaj.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/25358236225.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8c7682ad3c80a5726d7fb1238e5021dc/nesovaf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411610b8c0f---14023712107.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/92412410619.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/55918361588.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vogufi.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/3484129244.pdfIn PDF document text
    • http://tfforming.ru/d/files/17459014343.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/voniwenadasanol.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_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 17560 bytes
SHA-256: 8f4440e97a7f13ad85965568b472af4d747dbbc7d410cb72107ac95af4dec89c
font_01_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 9940 bytes
SHA-256: 8fd4bd65747fa14c3f280e3095232dfd1c9c831202d257b01831663297ad6bc0
font_02_sfnt_off000144ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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