Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96f20ed092f4f66…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 02:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b479ae3b33715e8eda34e80dea1972d3 SHA-1: 4897c1bea25b2f97acede62a9ff027cf4a1499d2 SHA-256: a96f20ed092f4f662793f54c981c3d6ca133237be09f8a3806e5d0822ff34dbe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of a link farm suggests an attempt to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.cerathai.com/image/upload/File/defera.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83af485451---bojejinop.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/62971894126.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/81945218653.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/sujukipimus.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/boxexapilij.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210716_095614.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d031f793b3---wudot.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/18660262633.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2oliv4atkl7ggqj383hfsqroe1/46649109942.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/94454045989.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/5862760827.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/puragojeweger.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/19409048552.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/bixekebumexotigunetapigo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/risemubopozizefemekejonoj.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/tokomo.pdfIn PDF document text
    • http://15881588.com/ckupload/files/85693594658.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c24dd16c0e7---kojujudabobolebopuxojewof.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/abf77ad9c6921d32460ba1e3ca6c1c28/64791069713.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dgjcgeglgm3tdf8umceqdk4o33/pinuluzekazaxa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1122086b---rojevazosisigusemoto.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/jumevubigajelomazenir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pancreatite+aguda+pdf+uspPDF 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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10732 bytes
SHA-256: 9ebe873542142fec8d7ebd2a25b3e729b2d782f0cf53cf53091da806b8d034f2
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 18860 bytes
SHA-256: 115720c854adce63585e6b518a853d8c4eff231d703ff251a5b661360742299c

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