Malicious PDF — malware analysis report

Static analysis result for SHA-256 891c740fac57b53c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 04:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c068730d8aa8bc935e11fa18f7150347 SHA-1: 1fa3edee37cdffb7a8c27a8f78558d898f41faaa SHA-256: 891c740fac57b53cf621099f8ebf68f6de152a7a2d659c7a0c6259eb5052e171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and potentially disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e5ec099ecb00d3c9b2cc0bb8e199d6d8/defalebo.pdf In PDF document text
    • http://izeninfo.net/admin/upload/files/vosesimikel.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/wetub.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/60913459149.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/kesebarumalijijeremuruj.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614153931b7f7---wexororaf.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/fixakiserubikadizunesurun.pdfIn PDF document text
    • http://micruts.org/userfiles/file/dutovodavinuj.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/75789573648.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/53938294184.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-28/20210928041727968986.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0f38365b---28877112551.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/30936969517.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/133b65fe53347bbec9349c4f9ce4c611/27907873468.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/gefugesafaxosisibovik.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/6035855481.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/7505145170.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/bizabomewarogesagiziju.pdfIn PDF document text
    • http://klenderbio.com/upload/files/84475477831.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/77986353943.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/75127742551.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/03aec55d88d77db18c18651dadda2e01/70942081570.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/aqt71qjadkuu742qpu3or08jkr/xegesovumometulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+see+who%27s+viewed+your+tiktok+profilePDF 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_off0000b4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 17064 bytes
SHA-256: be5913c3f4f9999e64b70196292adf3e3175807416a18d06c1fcd9484fe96c3d
font_02_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 10812 bytes
SHA-256: 47f94f13131fc17b7caf525805e70c4bb431ca70a3197729635fd2d323015ffc