Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a796f70d5c281d…

MALICIOUS

PDF

99.8 KB Created: 2021-09-04 09:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d97bb317edb37c16d6474c0f116ea247 SHA-1: 51fd87d68708a330cb0907b9b39f2065d13fc23a SHA-256: 39a796f70d5c281dbdc8bcaddcbeb24fe2e1f97a675f2e494eb0ffae2c1b3182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=c%C3%B3digos+arcturianos+em+pdf PDF link annotation
    • http://milwaukee.center/userfiles/file/sufevupe.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/13275535845.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210624_CD9872959C6CDF5C.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/84008557047.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8193004fe0b2e7691d905bdc3dcfa57e/99680867043.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/89386945426.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/fobemos.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb77f65acb4---netobebazexaduzadonid.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/69284382975.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/kuwuximuniponidijuwema.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/78909030401.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/feruratosavepisanofedure.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/nalilanazej.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc631d4e3---4819920129.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/kamuveritexivaw.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/wadunobijewakudegeresomi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/158d241cb5c82e5f0b5669435b09fd9c/23071085854.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/xukikajul.pdfIn PDF document text
    • http://dnepropress.net/files/file/11637197874.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/52943309803.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2030c631465f79db52512c2472d3a32c/27103974670.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tegiganuxovamemadopefato.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dinuviwaledadejarudap.pdfIn PDF document text
    • http://berbun.com/user_img/file/bizajikodofib.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052721231179.pdfIn PDF document text
    • 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_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 11184 bytes
SHA-256: 8871a463f6b1a8965657316834406c7c949a3e16a3a5a40f1cd0e9b4849b1f23
font_01_sfnt_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 20988 bytes
SHA-256: 95ba6a8adf99f53149c062ada56dbe560c0991e119d517c07d294dab5c065932
font_02_sfnt_off00016763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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