Malicious PDF — malware analysis report

Static analysis result for SHA-256 8623e721c0133171…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 09:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79599ef87c494a52dcb18d2c3fd1459d SHA-1: 68e7bb711578941456f1a6ec4daa11b46c5f5ddd SHA-256: 8623e721c0133171dd40b86b5133de3e5edaf18483f05d6c6a2a18ed277451d6
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6968

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 http://architettosbaffo.com/userfiles/files/81183632557.pdf In PDF document text
    • http://share-world.tw/userfiles/file/tuwinaxogiz.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/puxip.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/42801880421.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/dibupugobiver.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c36cb77c6aed98c9ccc1e4d07f7f1a83/guburew.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/geforarezuxebo.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/juwigogezofewibag.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/10003742168.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9108c95406bcebea4251bf9914f3a3f2/pezewuwov.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/76472264791.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/xavovisewifinix.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/xitewepiwelupofadibubul.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27dce74285---kigapizanolij.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/95040113905.pdfIn PDF document text
    • http://charontrade.hu/data/file/zipupelezeve.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/48273863427.pdfIn PDF document text
    • https://norservis.info/files/files/97639012588.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238dd16b76d---wegixofadipofipof.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fabf2d18---lutafobizesadatowug.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085a2efefe02---10990622882.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/64259145242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=health+promotion+model+manual+citationPDF link annotation
    • 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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 17980 bytes
SHA-256: 3cc4a42a7998ec20d6502e1eb8caaf83146b70eed0f6c7ce2f4582ba92f4f56b
font_01_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.