Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bdf531d5b06e2a…

MALICIOUS

PDF

95.9 KB Created: 2021-08-13 08:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a77729dde56b804db8e6ca42ca4506cb SHA-1: 87aacc4abae78caeace0256de038b3cc98a4445a SHA-256: 92bdf531d5b06e2abe3a3bcf3e950cf436a32afc364ed1ee83e1b4ffc1f5dc9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware-hosting pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=citation+sur+le+r%C3%A9gime+pr%C3%A9sidentiel+am%C3%A9ricain PDF link annotation
    • https://olivier-daulte.com/ckfinder/userfiles/files/dijopigaluraxinozikoso.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/daa00baab1182311a22fd094662a19be/45855475946.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/38785228258.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cf4595d63c4000513f6440dccb722ae4/74718334129.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pcop2rjces35epmbi13gq57k3r/56546704800.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108122136173478.pdfIn PDF document text
    • http://dnepropress.net/files/file/50140785781.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8e45950d---zalomaweputafivupejusix.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/husslp22ti9btjnfs2jfg0i8n5/86227602393.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/28532188768.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/gukemifivinad.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ccd1da5bc---38795312774.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/bj6iutrpbanuk3dj9gk1t25pnp/72847106955.pdfIn PDF document text
    • http://iphysiology.ru/upload/27929400978.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/30f7ff6fedfe9fb165fad51278e1d6df/41507971146.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/18783996009.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/noragarezinobupetikesifot.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75531741112.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/pamoke.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/15256041949.pdfIn PDF document text
    • http://compsult.net/userfiles/file/99430770283.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lslcveke5mu13d6ml7g398l5l2/zovijudefoxusafu.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/legakajagibuvarogadodiz.pdfIn PDF document text
    • http://artside.org/data/temp/file/63487070987.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c8b1a063d2e0afcd08d956bd6d072a3c/97476572541.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 19836 bytes
SHA-256: cfe02779792a621fe6fb12ba001162aca1318314c7c07b54029cc09494c14941
font_01_sfnt_off0001353c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 11140 bytes
SHA-256: a2a5b851fb1136bbefef3e7bab74fec21ecf5809c0c0d2cc27ede070e9106f77
font_02_sfnt_off00014ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000166ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166AB 928 bytes
SHA-256: 3c15da991b16fcc268d8d33266f0982d2616c8d8d09e4e64322fdaef7a2d7494