Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdb3ca22ed02f89…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 07:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 561802042e6e6b9b23a8b62f9052361f SHA-1: 68e8ad9820b973350f0b55ddb2d023b4b0b8863d SHA-256: 7fdb3ca22ed02f8925e258846ee3988ea3907aa24cb057163895d7069a7f1c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains a link farm with numerous external URIs, many pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1f7e1562---92889121008.pdf In PDF document text
    • http://barudan.hk/UploadFile/file/20210904075324071.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/futokerizurepovi.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/taziganufojarevegefuk.pdfIn PDF document text
    • http://jawarakreasi.com/file/vizizizavepe.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6105e0cae---pusunotijubokatun.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/laramozagosofetowawagob.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/44012227759.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/87347538491.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/ramuvuj.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/vaninetimixovajabu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cf9419ad9---5042406424.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67dd8b172---68149417124.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/lazeboto.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2b055c63a30bc14f00338f0f721ab576/94208663126.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/pesibimezufewitiz.pdfIn PDF document text
    • http://centromp.it/userfiles/files/lerobinowivelaxuganif.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a93eb5caa---gawapixajovozigebeg.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/fozuwisulediluxid.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/76523654320.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/gimevinofijiporozofa.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/soxobuputusufivegalopopej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cognitive+dissonance+theory+of+mass+communication+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_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 16916 bytes
SHA-256: 170b58128cba9172f7a9e4324b32bb0d5f28dd1e20d8d6683a36dbe1988f5ff1
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 11332 bytes
SHA-256: 6a11c9d0add4772f4c9aa5b8dbb1f02d37a4464bac8b87f86e03c54683fed5f5
font_02_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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