Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a8438843d3badb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 16:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc16edc157cdef6882b4b454eb953f00 SHA-1: c0b0f37e0c8762b5db63571f9c279ba9784aed18 SHA-256: d9a8438843d3badb227d8cbe2f5c25cb4669cc98b0f72c28893ea959c25e4e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=plastic+extrusion+technology+pdf PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ce2hrjso5el7r0800eii8eoj20/57954206263.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b828c0bdd---91645600370.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/100cf632a58dfb84f5887b964ef0b603/60586803496.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/bokaxalixezefot.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4376f72816---23257735785.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff5c5839f---53388839585.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/99e094864322cebe96c93997b2817e1a/82367716311.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/fedebiwasukagujib.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/168112725661358a6509c82.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/00da54bb7de432483886fdbd929eb9f6/98424332232.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/norotaxapitorepizo.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/zorabas.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3c2a6e6661e69cd420d2af20fc57ec52/90875991465.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/48842219126.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210815225334.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2d2c09c0---80682705532.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/ladexepuzumutojewutoxufa.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccb924c9d---41624194730.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/49236679539.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3a60472ab4dc8c79d5e8cab2444ccd64/robazazurumugudaxijesuxi.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/58042979405.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/90920467450.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/70885947936.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/60985300177.pdfIn PDF document text
    • http://standardamulet.com/files/files/zukubenisutiso.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fa143835bd7---daxomevisojadapaz.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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 11216 bytes
SHA-256: 437660cf52edea6255d843634de3e8c711cb2348ba9403ad01f38a1d0ad2077f
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 17380 bytes
SHA-256: 0acf7f91ec8e896f2f856826a1a084f392e4df735d2269c3b313fba6cc99e975
font_02_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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