Malicious PDF — malware analysis report

Static analysis result for SHA-256 b475ce9fc36f62ba…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 23:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f3cc8e1484cdf866e966e410380f944 SHA-1: 8c03eccad963bd71c3f80a480ded1b9f81664eef SHA-256: b475ce9fc36f62ba7c76dcda5ee1b41e7c45773e637d96c36a547ffebef10a7e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/boxutulipefelorefudu.pdf In PDF document text
    • https://uangraja.com/contents//files/soxovutepipuzemogebik.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd1e31d5df---sarin.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3757fd82---66260925925.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d664b6efa1a---89511757401.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/47064481599.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/bofiwifufimiw.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nemipi.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/bjgo9q7792870342mugidr4q53/sevunurozulewikubadaz.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/11733409892.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/wazonelamedufenekotexuki.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9912adc9---63080392983.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/7431961525.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rezelazegibivimolabubel.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/xikumokasonevibojoluxegi.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/97469347273.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/virix.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/13081421900.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/selaza.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114aa4dbc2f4---tikujumutolim.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/28610940819.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8833e52dc---49352640561.pdfIn PDF document text
    • http://arslanemlak.come/file/xifugujulakamijene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=we%27re+going+on+a+bear+hunt+michael+rosen+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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 11336 bytes
SHA-256: ea49c54b549759aa6c737567ff538c0f2d4512d82ff443f70905d085c8e834da
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 18212 bytes
SHA-256: 21814bb4ce5e54cd54d7719f24a6a73d23e9d4ec5a193adc778f68504d89f394
font_02_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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