Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2b513804b22fa7…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 12:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc651298713797036dc0f3cbe48e6da0 SHA-1: d1bcd81c91525834a91c086a1f058a776854b011 SHA-256: 6f2b513804b22fa724816d14f49c261f0c7cc527472799fc5d5ff29f7474d822
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm. The primary purpose appears to be directing users to potentially malicious external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://architetturaurbanistica.it/userfiles/files/kesanufadatalaxi.pdf
    • https://n-zvuk.ru/upload/file/nugawaxilebigezidu.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609938e3ee9d0---terid.pdf
    • https://alihuata.com/userfiles/file/bujasalimural.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a0aca4be1---vabukafe.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/wepadozefa.pdf
    • http://promocode.lu/userfiles/files/luxofolowavoxijida.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c8f5b2c1---83764132777.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/92916336613.pdf
    • https://0955205219.jwa.tw/userfiles/files/tufuxiv.pdf
    • http://koreanhotpot.com/uploads/files/87602180544.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/53a83f330299e3d23390cef53a31fca3/nemikesa.pdf
    • http://aostavet.it/userfiles/files/kepamozeluwuxikivi.pdf
    • http://didaconcept.com/admin/fckeditor/file/60949691785.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4c97e35f---vetefedokivina.pdf
    • https://mysmartedu.com/uploadimages/files/mukejuvaratulewemagapivi.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a444ca223fe170942d01190c314eb54b/47435787143.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd200da0a2---8757543197.pdf
    • https://shopinhome.com/ci/userfiles/files/34103914696.pdf
    • https://sharadsangam.org/UserFilesTwo/file/kazamejibogejozivowimo.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0684c9b328---nevofuve.pdf
    • http://i-harmonics.com/upload/files/xogeboliwodezijajegof.pdf
    • http://choinka4x4.org/cms/files/file/powasuzimakowowumibanusab.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/80161372316.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=physical+chemistry+by+op+tandon+free+pdf+ebook+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c062.bin
006709d3bd5ca5df88101319e638f94ec4a527c88c9a77a0c57610828ab30844
pdf-font-stream PDF embedded font (sfnt) at offset 0xC062 11320 bytes
font_01_sfnt_off0000daac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 16792 bytes
font_02_sfnt_off0000f2be.bin
5d6acaca4ee1ecb0b87ca29ff4ff9e999af1da21d53246447b820e37fe8caf64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 17104 bytes