Malicious PDF — malware analysis report

Static analysis result for SHA-256 38554b8273bdcfda…

MALICIOUS

PDF

100.8 KB Created: 2021-09-07 09:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7698e5aaba673c34d87490cb95ef4e31 SHA-1: 5a8ad1e6e9a84dbe5ecac0498bcde9d1705cdf50 SHA-256: 38554b8273bdcfdaff1aaad22508ba2e20ac03c3b2f8faee68712b5fda1b5cca
204 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. The heuristics indicate it functions as a link farm and employs social engineering by presenting a fake download button and luring the user to install a browser extension or update. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest it may lead to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://doosradashak.in/ci/userfiles/files/bolipetopumekifesuluwus.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd392b5f1e---zopotuzurixuja.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/70625277399.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5e0382934---80777755749.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/24ef367599da30b42ff1e1df399ded19/17736882177.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/denonib.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/lalabiniwafosuxonofufis.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/59303560781.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/58346078912.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e886c951985411b2d40fcc72ad140273/29097876415.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/62730986087.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/sivisapubaganagofugu.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d0fa5542dd5b5591ae1dfea2bab0abd1/40486925165.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/lefewivipusuzuba.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/bijomunaluvififafudem.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kexadusidum.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/41684863430.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/33920169585.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/vukiduxaderiletotuwejewo.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/kijibipelovawegedujefimi.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/wunupawetib.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/daxikefamugobigaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=split+pdf+into+multiple+pages+for+printingPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1eb660cc86283e7963b4ef70d2b4686d/jukoge.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_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 11016 bytes
SHA-256: 8b30f922cd73fad92eba37e056a9f34dbb894ef175f724a62ec65c308614699d
font_01_sfnt_off00013c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8C 18928 bytes
SHA-256: 87acadcba2e8c55cfc5f6369dc5b007f70fb440d5bc0d3040f1b3afcf9f24f36
font_02_sfnt_off00016cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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