Malicious PDF — malware analysis report

Static analysis result for SHA-256 434aedde29b96331…

MALICIOUS

PDF

71.9 KB Created: 2021-08-11 16:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12eb1bfd6a62011b0837b596a29aee44 SHA-1: e8dd8953794c99697a2f1b8ea4771b50f1bd87d5 SHA-256: 434aedde29b963319943836bea298ec4e413b5ebee0c8c1a0ffee8e21c1a7e9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bda1a73c7c3cc02d97cdbe0cade92a3e/butidodeb.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4fe9f373---koxonesesu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/356ppjfvfb9masc35j11ajifg5/gimiwite.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/lokapejelilokaki.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f13c5311a---87517759303.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/49406329427.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca8b27969---lidivufopibuzereto.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608620e762768---rekatelozazev.pdfIn PDF document text
    • http://allycatering.com/userfiles/37772169427.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608450c5a6efc---pololirisu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098235e42630---bofinap.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/wexakenula.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7f910db62df78b2875c58c1978012d3f/74552363416.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/titaguje.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/dibotajulitupenifi.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a987d77e2f375248225f08a14c3c874d/36008516582.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908cee18eaf---25223492740.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d174e9c97---senitoze.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/46460766587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=libro+el+m%C3%A9todo+del+lobo+de+wall+street+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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 10892 bytes
SHA-256: 785a8fb6963a8c985f880c808291a28854a15fbc87846f606bac850f950164f2
font_01_sfnt_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 16876 bytes
SHA-256: 33f103029d9365c383823b78428935033b211b46d6071c1d66783dba1b1c670b
font_02_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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