Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7117a1b83e2ee1…

MALICIOUS

PDF

194.5 KB Created: 2021-07-03 11:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 520cd9688e3b88b41b2e41946238f0dd SHA-1: 1a2085b2bf629a0abc5f4c07a3b967fb10f4b406 SHA-256: cb7117a1b83e2ee18aa33e48e9ff734055ae065c24be4a851fcce78b9b39fcbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://queure.ru/uplcv?utm_term=why+does+the+poor+man+drink+coffee PDF link annotation
    • http://summithigh75.com/clients/867147/File/5605864790.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/053922754fec0207455213e471cca354/bamageme.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/977a3579f34f26bf047d800218c8e9f9/nutovoxifilajenubogizebe.pdfIn PDF document text
    • http://qca.ch/userfiles/file/lovogeda.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/112a43cc2010a70d89155b785e9f9043/24127008575.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c0b333f97---87224663238.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jie9ua6nopnrk50sjsj32t96oh/88879930357.pdfIn PDF document text
    • https://norservis.cz/files/files/kisipujewarepukufefezu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a5aaea750---pokaz.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1af55e8e---tomavabu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/031017172743673e4298a220593d4b57/63000940131.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/sozolizikotegug.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/08a2041def39af2431d53aa12b99c332/doguveleninuzufaxonujad.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105211218472600.pdfIn PDF document text
    • http://abpaluso.com/upload/file/6577293046.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9287773566---lebajepugopugop.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ph23kf2u30003s6skcaq004de2/zodezuxenutulenox.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/gubukovezujiwa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099dee9c9614---33090958420.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/rabirerepazinomedibegoman.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c58a778cb---jizigelimomupemes.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/df7ab69c06ff4308d57d79f026caa016/bubodinudixijedak.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a430fa4236d84c7ca53b2e6042fdfc9b/tukefupinurepezovorolowiw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002899c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2899C 21316 bytes
SHA-256: 7ca2ef8dc52fa6b27cc2945f7df1d5c912472bf2af455d7c8ef83adb4beecf1a
font_01_sfnt_off0002c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C01A 11036 bytes
SHA-256: 79ae0ce7a9cb674324e392534c474fb08eac2dba19b8749440e5d830f9e2b35b
font_02_sfnt_off0002d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1B5 2320 bytes
SHA-256: 15f3b56fa8fae72aeb3eecbe9825a42eafef4855d8ab9be2ae0c4e8103864479

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