Malicious PDF — malware analysis report

Static analysis result for SHA-256 289bbc15494eebe1…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 19:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8155d2360e9d2241fa12d79bfbb75d30 SHA-1: 5b920b7ae617f93f558c5ceb96f0df48bdb7dd67 SHA-256: 289bbc15494eebe1c64eb55cb6c60d65f3d5d4f6b94ce5a1ae4ae2d52dbc2cb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to external, potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5631

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=android+app+free+source+code PDF link annotation
    • https://phuquiland.com/upload/files/31622030304.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130387be2339---zilesebimixotetuguxowa.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/43025719989.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/5014776017.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/wonav.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/vewodosefakujozezo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c6613319c79cbbf9287277e4001340b3/kuwilapupolubop.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/jonedubop.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/rexazaziloniwubabib.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/jenemepelepowanisibotexe.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/64746044344.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/suveramon.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/nuribop.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/39539464654.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15307945629.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/31489104218.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/bemel.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfd1ca3d54---64480956812.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/welujaka.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/30081080614.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/89363000642.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jesiv.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/lofota.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/40874221308.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6b449b8d---bifuxovej.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 17208 bytes
SHA-256: 5dd705f171c1b1550efa47b36127e285eecc91eb4234b1942ca89c9a876eeb28
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1