Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbff329aadda82e5…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 18:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d417fe25213667b834bf704c0a66c76 SHA-1: 0f2c22d47b1e42683c016b85e0f5d2caa5cf4939 SHA-256: bbff329aadda82e5e6f01dee3792c6f4f9e9222bd579fcd87167019664028b51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://weldingportal.it/userfiles/file/tuvilavevizav.pdf In PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/78327883858.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/bizaforexixizap.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8786c72a197a3e430c30514917b33883/97425107411.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/80088460007.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202192_6626_820.pdfIn PDF document text
    • http://platcometals.com/images/file/99517026403.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/60110960740.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac15292789---ravope.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/49114667266.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14497735213.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/dinuf.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/gelimu.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/lajirobuwogarasav.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/22964957271.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bc1d7d6611310bdcf4fe987922932230/ketesokedat.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/wosazelewir.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/62781286864.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/43091475108.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/rabawisexijor.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/jilozifupeluga.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/14630683183.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/kekuguvadojifunemaxemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+amharic+keyboard+for+androidPDF 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_off0000b140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB140 17488 bytes
SHA-256: bfdadaffcbe1bc59688f0f0d26f13dd7d1a47029e0b0cbf60ed840095d43cee5
font_01_sfnt_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 11092 bytes
SHA-256: 6fae4997ee70d2dd5e2dcbff2a7b63fa50ed8cfcce9ae31d17f751940763b0fd