Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5baf568087619db…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 06:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5a62895be512e310fcde2c3deae5487 SHA-1: 3ca0356f74479ac51411c7c0633c0d0b57d63a74 SHA-256: f5baf568087619dbcb6f6460f1e021a288e1f1670b5fd7cb4b70880acf8a32dc
164 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 file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, forming a link farm. This suggests the PDF is designed to redirect users to malicious sites or download further malware, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=what+two+colors+create+purple PDF link annotation
    • https://kimcert.com/E/file/18527700883.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/jemidum.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/64650882668.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f65ab989c---gerejetoxezusiburaxitefo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bf7b002aaa1f2a6c3d71cd10096520f/38714211877.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/28311504577.pdfIn PDF document text
    • http://sinostandards.net/upload/files/94757122244.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/25808431869.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/38190638194.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/60514670172.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/48285933272.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/zulogexexujiwo.pdfIn PDF document text
    • http://ttc-investco.com/img/files/58466490028.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/aa49fa05cab30c1367c7a70ed34b14f6/94306975546.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/52098493999.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/pikurunusuwisi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/07f540ea9eb69fea9bb408fceb134b95/xowuxital.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jutomejenasenibunudekot.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/lumesawunajov.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/1489627543.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/75762903440.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/42061169706.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/vadajomanadi.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dutazesirone.pdfIn PDF document text
    • 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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16444 bytes
SHA-256: 5a8e021989a5c183333ee76db8f015993c10f06f83e5ad9c7ee90a07098d9fe1
font_02_sfnt_off00012be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 10452 bytes
SHA-256: 406e4fb4bc0e6aca20c124eeb7384b8be9a292e36c07946ebe4dff52aaf093d0

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