Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2df7e0cac5a774…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 23:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c0e756efd003e2eedcaae5d7247511a SHA-1: 08358665453d5b31189d88d0f28c7beef4e75289 SHA-256: 8b2df7e0cac5a77487b2a04ab7b956f464f156005bb2dd6cc554f90a90743231
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 http://www.como-grup.ro/fisiere/file/kedomo.pdf In PDF document text
    • http://thsport.dk/userfiles/file/61726906444.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507dabba7e---78762954401.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/wiwij.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca8bf2323c---54736300281.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/64832518579.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210912103326690473.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/wobuvigasupubofam.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/taxinuzej.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/73549583376.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/jevovolufili.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/33360317449.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/44510433601.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/somemule.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b95dbca994---13833756399.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/gabogijozeganatobijijusuw.pdfIn PDF document text
    • https://soechi.net/userfiles/file/39671680461.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4d0d2804e30fc66903cdd5e8a2b62305/nujifegew.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/81382939314.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/37620086624.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/pezajukijet.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/72684094191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=kodi+for+firestick+2020PDF 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_off0000b112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB112 10480 bytes
SHA-256: 0adf22620f587ec9725dc68b468ed43b6b33921475d2b0405996a9a7f7a641d3
font_01_sfnt_off0000c91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 16284 bytes
SHA-256: e80386e3880cbe552825b9c83fabec9a403786a544992625b66c7616e93d237d