Malicious PDF — malware analysis report

Static analysis result for SHA-256 c899b185ffe130c5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 11:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb1a248a9fb1d0243270b91e3668ba12 SHA-1: d23d9171ead149a807c5adcae6e13d40068764b4 SHA-256: c899b185ffe130c5d2443579c0498f0dbf5d256b68fb1c7f2bc307c228cd7f5b
196 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic, specifically a browser extension/update installation lure, to trick users into executing malicious code. The ML classifier strongly indicates maliciousness, and ClamAV confirms this with a 'Pdf.Phishing.Trojan' detection. The document contains numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=difference+between+mi+and+redmi+tv PDF link annotation
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6a96dad8---52101864785.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/48484400740.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/viliniwujusud.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/86733350385.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/84340954694.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2ilkhj450kac7edct4272sss75/fimukebakoxigufavoliv.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/55313959686.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ade62a98---juvixonatimeza.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a7259755---zidiko.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/xijapawuju.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/69841267545.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/rerekemonujevolar.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/tuwodotixuvojilu.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/neziwarukej.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/zexisajipawumize.pdfIn PDF document text
    • http://parateam.cz/file/16021050415.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/99630608171.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/bfd7aecb01bad49e7b3f5c7501b30090/70454023415.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/najizoza.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/69796288625.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/49311951447.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/42854570254.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_off0000baeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEB 16564 bytes
SHA-256: 5f12aac7434e493e11a7c0b895189d989b763486f5ceec1c165a297487b9388f
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 10596 bytes
SHA-256: 468c3b0fb2e7900a5e5b7c570ffe9cdc5173be53392def978fdd5bebe522973e
font_02_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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