Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86100ab31863a2e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 09:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 438263e7bee6761a00d26255f6782d5b SHA-1: 64c44d9997b1b4fc4e180710e8769180d7600741 SHA-256: e86100ab31863a2e94b5ddedb796cf6ee3bcb0b13b4c4418d72f3f15fe0b9703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters suggests tracking or redirection, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=cs+portable+unblocked PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f579c9abdd---40700670828.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/piviwabezaji.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7dru8p55sbdimsrf95vd1avd9q/24720587105.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/xozujufefa.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091311032473499.pdfIn PDF document text
    • http://ruihuitax.com/files/file/82671835530.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109071058086855.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/79805010849.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614160346eaa8---xizaboguduwipomomabawex.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/71134782800.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/55151597494.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/valisoku.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/wigenawiviremed.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/8987623656.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/tazoxazikanemigef.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/22032407064.pdfIn PDF document text
    • https://zzwgjx.com/d/files/sorus.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/33252542504.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/21402546199.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/46028931297.pdfIn PDF document text
    • https://somogyplusz.hu/files/gigametesosofapikemu.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_off0000b0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A1 10776 bytes
SHA-256: 6cad3377388fb4186b3b7c2d3a595f6b0963cb95d4542066057b4ef68190e751
font_01_sfnt_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 19520 bytes
SHA-256: e5fafa4df08057fb483ce4379f5f3a162133e4ee9b9af37b8a81e344bcfc21ff
font_02_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1