Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a6ad9ca26f1e46…

MALICIOUS

PDF

96.3 KB Created: 2021-09-01 23:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec7c62e19e157d8bd8add193b045c71d SHA-1: 1ab8d352fa8543dc28eaaeb4e0e84680685d88d0 SHA-256: 39a6ad9ca26f1e46c29a931dd4c61e164d2d0c76d32eab605ca11c865511f99b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. Although no executable scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.anclupnapoli.it/userfiles/file/nutazit.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ev1b1s70v6n23q0p76n9d5a5qi/vipufo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5fe0b098ae3bca60521fe60297011046/jobigusijazurudin.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160724100efef7---lizikulonusabejeximigog.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e4fda127bb52a75781832dceb8ce277e/dawiwiduxola.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/pu7lfsqgi6sm5111uv396t6md5/seguxil.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/xiwetanutimesosefowile.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c804dcd9d3---31848672305.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/lezezexop.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9da2ac3c61---75691813928.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021571359127410.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/nbplr8mritdbakq35idjgj6319/nopelow.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/33499105661.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/8d4c1ac7313b360bdf344f748fc19cdf/wadibo.pdfIn PDF document text
    • http://topstec.com/d/files/66342462609.pdfIn PDF document text
    • https://educhina.mn/editor/files/61731442776.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c16ab666a---taruzudiwinugamotuzevugan.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1104b3f18d---lupisitijinuxabawedavofaj.pdfIn PDF document text
    • http://twinslock.com/ckfinder/userfiles/files/nelazoxezi.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/54698219870.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8769ec60---27847945311.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114b981ce4b1---zipusiwob.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aab65020e9---zovubuwifedizibefafejel.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2ff3dd64---28028945033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=blinded+by+thePDF 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_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 18536 bytes
SHA-256: b08503d6c85e1f47aea26a7c03fbf83f2f662c7c088c8a6036eace9bb2655dba
font_01_sfnt_off000144fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FC 10104 bytes
SHA-256: 820666ac1d7bd69cd26249ffb61e2e3b2c8f449cf735f08b81eb3e51b54b4cc6
font_02_sfnt_off00015b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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