Malicious PDF — malware analysis report

Static analysis result for SHA-256 557c44e1feba8a20…

MALICIOUS

PDF

90.3 KB Created: 2021-07-15 21:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16df4b9ba2704aab3c16bad67d0aeb21 SHA-1: de042b5beb7e11a649a4b4915e10b94ee39f09c4 SHA-256: 557c44e1feba8a2042f375a29967fdbea9db6bec395030d01ef5fbe47e20c551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=low+sed+rate PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bb3495ecb---zanaradefamosusu.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/kebalukevokawixiru.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c2571f03872---4288477610.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607c719edbfdb---fegewibumezexe.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/nosufifoxomane.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/melajutanuvane.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/mexufu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b788943eaf1---64230988543.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772d4991a1---topupagirupozuzegimij.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/72020308440.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/77973807924.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a603f06b893---fetonowuriworuva.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/suparisal.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02aa50615b---58265652343.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/46381248187.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dca3d154---54700425881.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a722e11c---legotosigomajefov.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/35356565635.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ctlakkh9c1btmog8a33g46kql3/zanarokesawixefodosuxeto.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/17865369736.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/iii5t5u53etf7k7go4rlbhto33/lawiwirigoxujafakoze.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3cb3f65c28da5271b4617cc5d97e4091/dagexinanomodaxoxip.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_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 19216 bytes
SHA-256: 4045cab4b5971da7c5c2221f4d5d1c1e35c5fcc339707458b699958b2c798c40
font_01_sfnt_off00012dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC2 10040 bytes
SHA-256: 1a621571ef1b0b8b12035cd895c098da26d2d3825e489e2aa3f2d75c5a8495bc
font_02_sfnt_off0001444b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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