Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c8ef6c958a258d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 00:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22c06bb6d20eef0515161a85d8b157ac SHA-1: 13dbc02fbbb911025c54839a27df74f7d3e59a68 SHA-256: b3c8ef6c958a258d99ab4edec9802da61f5684c49775b101ba6a99777569b039
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised WordPress upload storage, with multiple URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161338f6aa3132---gomejitajakonel.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/9904412208.pdf
    • https://mkontroll.hu/File/ganijigiba.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/ruwemoxigiwipuraxusizo.pdf
    • http://stolizstekla.ru/userfiles/file/feluxopatasofij.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/garokavubikamukoxadiwe.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161367a911b28b---tazejiv.pdf
    • https://aildf.in/userfiles/file/77403999714.pdf
    • http://e68momo.com/shopadmin/upload/files/88653031183.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/12523573002.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/mefukudebenavajedejugabon.pdf
    • http://sk4education.com/ckfinder/userfiles/files/mifetiwoxumitulefodanaluf.pdf
    • http://ankaraeksioglu.com/resimler/files/54117706325.pdf
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/99995449528.pdf
    • https://eurosan.pl/user_images/file/34591388057.pdf
    • http://yurisolomko.com/userfiles/file/86381971721.pdf
    • https://cyc-catering.pe/disac/userfiles/file/wutufexojusoxavexawigub.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f466f120e---likefid.pdf
    • http://markone-tools.com/upload/files/mubika.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/kirupu.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/kanekanoj.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xunoxuxefedurowopas.pdf
    • http://whatdwellswithin.com/file/3757396174.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/rizeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wunderstation+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a7.bin
552b9ec54ad094aa70529c7173f53b64f4e61d36cbc399d61ca2c6b91c9b00f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 10396 bytes
font_01_sfnt_off0000ff53.bin
6966ea0d07d5f673be30c258aca00c95223b22863434959e716646545df9b360
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 17620 bytes
font_02_sfnt_off00012c9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 16792 bytes