Malicious PDF — malware analysis report

Static analysis result for SHA-256 62017894ef61ccc0…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 06:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8dc7c3fc9bc1ea40bc5719b0d86ecd42 SHA-1: 38d9d6a66ff7c21a8e99dbe733cefdd662d2992f SHA-256: 62017894ef61ccc06a47aea5c8b4a6a9d4a98df0a12df6f90eadfac4c2b727ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a malicious intent to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=examples+of+hypothetical+questions+and+answers PDF link annotation
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/wamedilizifefodoba.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/77344595745.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7t5r9khbg0rah1mmpcastoddsf/15401221871.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/56459140994.pdfIn PDF document text
    • https://laser123.com/geektic/files/14539978604.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c0751b764fb8adb5bcf901c008f3d332/42313806494.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///49908425577.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/xuworukiduvugogajejof.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/d5729bacfa76cf942fea36ccbf928a81/73736112567.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/vipexojam.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/705lg6pf5f0c253fqvn1977is2/xewodetoleluwotud.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/didumutegosabogibajijetor.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/57764484164.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160953c41da8e5---92894339202.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/kfqfq6v77cu0abj98ork3nmsuo/rumegavi.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/26432010447.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/57d0da81a57c8f458afe3f96aa9a5f90/72670604027.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7fa2395ba---polalotikomefonibabur.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-08-02/images/files/61214851335.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/femokodemikilogomuwojere.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/819e1faf96245038233d1f7d7b8b660b/zuvavorokefewarazirileta.pdfIn PDF document text
    • https://andrejc.si/files/file/taxesizuzejarizajoxodanu.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/37521092670.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_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 11416 bytes
SHA-256: 23c526b7b497d5e9a58d772d9ddad27f8ae5292afdf5b0fd26f90bd6c6289131
font_02_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 15752 bytes
SHA-256: 0981b08d53dd0023747d40cb9142cb291b20d7c6c4f4d51fce99d5efc0720aed

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