Malicious PDF — malware analysis report

Static analysis result for SHA-256 421e2b37f969c7ec…

MALICIOUS

PDF

124.9 KB Created: 2021-06-30 12:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7ae00d270b1c844f494b1214f2d889e7 SHA-1: f20332b1b2b1783ec770b70488309ac6ccd4324c SHA-256: 421e2b37f969c7ecc81a9db8d0d27eec9e9ebdeec5ab799554badd5c7c0ed730
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or falling victim to phishing schemes. The presence of multiple links on disposable hosting and compromised CMS upload directories reinforces its role as a distribution point for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/gotasafimivivazunuk.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cdeca0fbf---xokuvagevip.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797ee92af82---50878873468.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9664a84631---nesuwigu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160897fb96eb15---repobetukabujuxasimurisur.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a48b5ffc6de37e6750f972c420cd3a79/lerupalibunoxu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b376bce37595c8ccfc8098e69c6f8524/vodipidexijepuwegufo.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/8827040780.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6849f7bd0fabe3274ce55bda0bc20f5e/xatujepupifo.pdfIn PDF document text
    • http://ridendo.cz/files/file/36119761616.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/43531238248.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f628c833c---wejomapegu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b245e869115e5dc48b8362209003e715/84077661280.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/512162e58aeabb0cfc2323ab14b5dff8/begununokukizitofupiz.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/88644df798531f5d59574072beb6f859/9593278078.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c065cc893---12098920006.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/69374544392.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/lajis.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ffd94567---55273698738.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/44192142724.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3986b0a8f9---dikiwigafanotirijojuvini.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d29626525b4---70454846675.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8da08771---jobevije.pdfIn PDF document text
    • https://hojoairport.com/images/file/tujomibusafelake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=good+to+great+by+jim+collins+pdfPDF 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_off0001852e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1852E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D40 17860 bytes
SHA-256: 4e543fb1caf082844d3218134d806d7861e633b34ab43636598e9d0494308163
font_02_sfnt_off0001cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC05 11384 bytes
SHA-256: cf8e55e864c0950ddd6b67cbc26d32ce14fa9a04ebfa168fbc75ba81ff0e212b

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