Malicious PDF — malware analysis report

Static analysis result for SHA-256 0818d09e0ea50339…

MALICIOUS

PDF

88.7 KB Created: 2021-08-04 18:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 76ec8ee32ea1e0709764b87beca2762d SHA-1: 39d0028654b895f2d117c68a7c549aa4718bc449 SHA-256: 0818d09e0ea50339c41cef3d2af0198e06b2e3e3445cfb976d48745962691e79
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it's a link farm and a social engineering lure to install browser extensions or updates. While no scripts were directly extracted, the nature of the heuristics suggests a potential for JavaScript execution or exploitation to achieve its malicious goals. The presence of multiple URLs, some hosted on compromised WordPress sites, further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/39vr61k61f387va68mgfpu5n0l/misenivudapovu.pdf In PDF document text
    • https://pharmnet.cz/ckfiles/files/files/bonojozufurogokafal.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/moguni.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf653a36d---2603377835.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qjnfn0dmgkfun99jqbd7rcksa1/80220205179.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b923780ae78---kabogasel.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/64350379196.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210804032157_mmmsvf.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/pimeioqt815kfruc598pkb97hd/vexivowefivug.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/nevanopivatafov.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/mipuwolu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c6e63d9884e8e00298343d46e13a8eb/nuzojogomitufidudolan.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f0dbb598---79587819761.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49256f2e---17920920770.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/10130645334.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/95051091449.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/79723766ea095108dc5ba31168cfcc90/71774785012.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26278785772.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9005668a9bfadd7e133efc41bb961ea8/tunirizugurak.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/kapazakixomonolutumixuk.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/wujenowo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160caccaeae115---77856399804.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/to39a1ojvcjml1jet0kabbtvh0/puvotebovonaw.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5rgutfsh1fmeh0ivdi9lsq9ih7/girixumewume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=instagram+download+for+pc+windows+7+full+version+free+ultimatePDF 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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 17184 bytes
SHA-256: ca65f552504a44b5fe881e6ab251cd85261875d4ca345ea886c4c4370420a8d9
font_01_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 11216 bytes
SHA-256: 8ee31f64bc3c91e242e891106d55840312f1b80e389be4171aab198cacddc501
font_02_sfnt_off00013ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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