Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c8e0c8e464ed6…

MALICIOUS

PDF

89.4 KB Created: 2021-09-02 12:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51bc6df4710ca5eca262396b478fc7dc SHA-1: dbba646cce6066f6dc9758315033d53186d666e2 SHA-256: 156c8e0c8e464ed69122e48d8901587ac49eeaa60a1d71c04033699b19dd3155
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links align with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fotojursa.cz/userfiles/file/87516231187.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae9fb56be---vijozamoremirabujaj.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/8026838329.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/40163489976.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vebotubodixu.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/59255550750.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/lofoduxiposivuk.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cc46d5d0b8---14856373930.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f123a5eb653bccfc61870bdbf779fb1a/zepojugexufogefemanenomef.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/58607451038.pdfIn PDF document text
    • http://fxmeat.com/upload/file/63a0c33e51c7c21a6adb56c4e3168e81.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/waliwezabalozof.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3nl0q883hsads7f12ipkrgq9fk/razow.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d6sarmg87qnqh4il0k0hf8chr4/97461962639.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/kajazo.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/fubogod.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fuvisiwolumuwe.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/vedomovi.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/34724373520.pdfIn PDF document text
    • https://medtek.vn/storage/file/kimemedifalebafevik.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/95309772361.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/3151559064.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89156700059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=%C3%A1cidos+grasos+omega+3+beneficios+y+fuentes+pdfPDF link annotation
    • 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_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 19672 bytes
SHA-256: 912d6549fe2844d74ce8e120e8a6e09d50ac82e8c39fd8a695acc428cd3ce6d6
font_01_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC9 11444 bytes
SHA-256: aa5eafa34a8234595b9956302c6979d7d2a09458316adafc7fd0844726217c39

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