Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c54a5b62889eacb…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 13:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f15cd402a26b4371a5b3534561cf2d2b SHA-1: 70056085fa6cd1862bdec7c6bef89039d4eb5cc8 SHA-256: 5c54a5b62889eacb0ea0423e3d42502283ccad05823d9865cf7eb9c0a3d50ed5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous links, some on disposable hosting and others using UTM parameters, suggests an attempt to lure users to external sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6kle9gc867tum9ak9q4ufl77cl/tafozazaderuvuxuri.pdf In PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/jusatosofigekujemimof.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xubumoxikabuzimife.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/656c15cf4bc2e6b40288da35f93854d3/katokojexeset.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/25130409894.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/76527359941.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26569969337.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/kepakenanenar.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/48222976846.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/giroj.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/22506952492.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/97551888898.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/66026405409.pdfIn PDF document text
    • http://hijoin.hu/editor_up/61004734196.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/nanezomodimewake.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/vowinabi.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/sosuzibunozugi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b537bd11fa---7665057368.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/67239136915.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/zedalopojofu.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/6283809689.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08339d12a---vovonefeweremudewikuti.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76ef616e9---mipaso.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/17522274540.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/zevaduku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=merriam+webster+thesaurus+apkPDF 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_off0000bad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD1 15316 bytes
SHA-256: 74299f8e98b52ceeb094a54349f330744d79b5748b0ab05f8b3e2965f0d4f2fd
font_01_sfnt_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10660 bytes
SHA-256: 3961e6b332e66c548de6557886cd06da9db3943ac6c07d9ead89d37fdcf747a3

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