Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5936aa00b64d09f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 06:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66f8c84c237fd2433bc4691b0c7f057d SHA-1: 91f6087f426419deac8c5e869e75b6f580733a8e SHA-256: f5936aa00b64d09feeccb27f9ea366b6122a85f3fe67c216ff42d02741f528dd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://redskap.ru/userfiles/file/begoboziwebudexedok.pdf In PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/zubugojolimabosital.pdfIn PDF document text
    • http://sinoorchids.com/image/file/gezas.pdfIn PDF document text
    • https://gilbertems.com/videos/file/88165807635.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ccdcc42953915a170124f9af1311e373/safanobikopabuwa.pdfIn PDF document text
    • http://kasargod.net/uploads/file/76233460416.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/88734062307.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/xowonovibarorutokevimaga.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///bivuvetuvuf.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/woxumopopana.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/965d8d09447421ce5ad9e3bda5687377/53747081682.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/11758939965.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/xigadusaziv.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/falokusikegupig.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160728827f16c4---jatujaxu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f040a266---teragejaxiniladotuguke.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/21872114884.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb0a844d6---17626905938.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/75787566436.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/87802462224.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/defuvimajitejowu.pdfIn PDF document text
    • http://esejsc.com/upload/files/nozipiwutobasefuvak.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24173478861.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161238112b67fe---70007799051.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62e9bdcc3---ziwifonetapukivixogodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=transtorno+bipolar+do+humor+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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 18004 bytes
SHA-256: c7d6105d65123237eeee96b457a43aff68723a14d2ace9f8e0c3d28282f7be31
font_02_sfnt_off0001326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 10836 bytes
SHA-256: 07d9708c1d49ed96ff203b0723bfeddd760e517a523826ed2715d775d1bf7c9b

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