Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05cfcf8310b787c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 18:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30b802c7326eea85452e61a256b7a842 SHA-1: aeecff638b71adf3e70c548d3edd721c57ec40c2 SHA-256: d05cfcf8310b787c61b704756af66b45f4ba40f26aca68265a1e23865f90160e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9cf5hk782svtk73ve6irkd71g7/sanatafafapezepedifuf.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607a431e1c19c---99431517172.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c770fb3ed0---23656763445.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a398b083e---27579737291.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/61470372211.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/balunajazamudixaxarolizod.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/19591362404.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/83048599274.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/debd5011dca569cbe58bca8a84c87a08/sozudof.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/tokadetuzune.pdfIn PDF document text
    • https://ecoretras.com/file/89139311142.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/tofewilowujinimip.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/zutamimukezijofamajanibo.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/weviparot.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/lolizuwefarudufuwo.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/tupubesotesunurob.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/20600122705.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/16418020230.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec39599a8---zebof.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/rufuzavedasezufodemifare.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/virujeferupukumalabixevom.pdfIn PDF document text
    • https://mihalex.by/files/files/firakebof.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/038rgd3g7msoo1t86g41hguti7/bikuneweluxunewilafoze.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/98a9963058fedf44b9f80779bfae4750/22010266206.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/59fe6cd009951055b466dd2d21f820db/45943324924.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/rabinajiditopuzafudijonuk.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fg9kqj0td66b29h55a69nthgj5/95834300800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pocket+oxford+spanish+dictionary+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_off0000b803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 10980 bytes
SHA-256: 68b4e12de0d3683eb0fff107c424809198a32369e7c3bfcbe03b796fd7d0aa65
font_01_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 15380 bytes
SHA-256: 577dc3337da70b1e4cf9350cd1783d5ef687c437154e95cde43431de122b98d0
font_02_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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