Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b8cfeb2bc8baf4…

MALICIOUS

PDF

85.1 KB Created: 2021-07-04 00:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd70909c38e7e23581dc6e22fc37160e SHA-1: ee0639014701c54ac250bc5573eb9f3b2a672ed4 SHA-256: e6b8cfeb2bc8baf47ee9aafc61e953c8ac4d7d7db3f8a7de0af311f2bd47bfa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://gabinetpro.pl/kosmetyczka/krakow/files/tomivomamoke.pdf
    • http://kpdb.org/userfiles/files/zilinibedikemalinapubir.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e693d394---9766529289.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eec510586---litelusomozutowunawi.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abceea0c3e6---nejapal.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/40371549247.pdf
    • http://tofuyatogo.com/uploads/files/61069786766.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7c6b4acd24bb6a8d4c79ba18e10cbb85/56152223707.pdf
    • http://aarogyamedico.com/userfiles/file/26589726688.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5c9jt4d70bcc8778bh431fg6n8/68598778969.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160782264a4d5b---57666144431.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/15830058952.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2b9e2c7fecad4f73be6188b6591a635a/bofifupokamazotora.pdf
    • https://cailux.lu/userfiles/files/69737165030.pdf
    • https://99shayari.in/userfiles/files/kinejuxixidirejox.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210507034210.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede2aadead---jokevenojevot.pdf
    • https://kipass.fr/userfiles/file/gafamisibowifoxerovaxir.pdf
    • https://vntdc.com/upload/fck/file/finuke.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b2cedfd7760c16a7fe257510c2fbf58e/sigusukodamonopetixanoto.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c991d730cea6660e155b91fd7893f8db/kimigalelunakapilafapesa.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/36dbdf4ad4761dad47907e2021bcdefc/56504058926.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/dosefemokofovexe.pdf
    • https://privatecambodiatour.com/userfiles/file/fekegakudoxalowulezo.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/tizum.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/xewaguse.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=all+the+birds+in+the+sky
    • 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_off0000eca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 16792 bytes
font_01_sfnt_off000104ba.bin
09ef8e6c08f2928c942d6c08f537970a72f05c7d61342f29def6710c1a99079f
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16560 bytes
font_02_sfnt_off00012fb1.bin
fb48643e8b905c62a79d685dd1a16b434367f279961495d5b4b8d61725ee8219
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 10388 bytes