Malicious PDF — malware analysis report

Static analysis result for SHA-256 8474e2b36f821043…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 13:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b3e2a702963e0e3c870ea16ab2719cb SHA-1: 80e135c510af2fab912b077eac5f319fcbc5c10b SHA-256: 8474e2b36f82104318aa511c7251d378d9e124952d83433434eea210f030c2b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple links pointing to potentially compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2e6465c5---vitomoxefupawobesulajef.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bfcf3dc6c---wubojezosekat.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/40958703574.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/57933378342.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/8134731655.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/sefegug.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/jowibapazedakonekim.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/88289611840.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/6182174065.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/budovugaripajejokoxudivin.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/loretavatufekixi.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pawoxadivowakilate.pdfIn PDF document text
    • https://777mto.info/contents/files/vopizaraxiwivogule.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/86042493744.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/50122359001.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/jijebofoke.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/38727813843.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hrf40h267h78j0p906443elbd9/kilapabuseg.pdfIn PDF document text
    • http://centronegozi.com/public/78725185285.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/lunup.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/narek.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/jitovan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=currency+heatwave+mod+apkPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210905/16308558933155.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_off0000b9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A8 17232 bytes
SHA-256: ca663abcee69c8df2c21d021d11882941f54bb7bee30126a84a5ae412470ef34
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 10960 bytes
SHA-256: 4eaea72f4ae53b09c6a280f3619affdc63a1612177ecfd3c40bc214892aac02f
font_02_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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