Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e28e0c73db8fa7…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 17:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2aa36369040972ee8f5baf50e2cdf2f3 SHA-1: ccb04b2e9bcbca8731f433697949de06979afd97 SHA-256: d6e28e0c73db8fa7d3fef2a5e9202a1b900cb97a995d3b9a6f64e657b23467ef
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to trick users into downloading malware or divulging credentials. The presence of multiple links to potentially compromised or disposable hosting sites, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it may exploit vulnerabilities or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://jyjwqj.com/uploadfile/file///2021060803232015.pdf In PDF document text
    • https://kurishupally.org/userfiles/file/4923211440.pdfIn PDF document text
    • https://papiratisk.cz/soubory/minisaxavuniki.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9558a18c---17781801325.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/rajukunefajaxuvinoguxov.pdfIn PDF document text
    • http://flexa.cz/docs/file/94029836028.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/91598666610.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b67b542f5---54106032993.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/96466899071.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9747e015a75e5849b8f991c993a56a70/53926615456.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608027e4da091---58795009575.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3ad4a18a6---wurozimarixamidu.pdfIn PDF document text
    • http://samtle.net/ckupload/files/marur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ffc5a3e5---lusunidoxositemufu.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/82445867579.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ebda8897---zonenuvumelig.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604ca0cf0c---59089832938.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb6a59ff3---25328500793.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac53854ea---gufonuwobimikagoxibara.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2a939cb6db30d726fe7328fbdf5e6526/tefus.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6bef266b---56125183328.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11dfcbae0---fajukesazesupeli.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/newoxoraxewokipabalip.pdfIn PDF document text
    • https://2acontractor.it/images/file/podujanekisabeleguzu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/88083951005.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160766f8b417ab---fibogugakivudeloxizugel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=larkspur+crossing+townhomesPDF 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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 11008 bytes
SHA-256: 4ad797c490643b0520f4f938110438d7b2d8d3b73a94fee7001db42e860ab084
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 17996 bytes
SHA-256: e2909cd46aebb5895f1d9e92ac3e307a2d3c58f9b17dda2187f4b48c96a8f1c0

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