Malicious PDF — malware analysis report

Static analysis result for SHA-256 5975738b0b2c16f1…

MALICIOUS

PDF

125.0 KB Created: 2021-09-05 06:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 398d6430232cdd4b62d27f284efc1f78 SHA-1: 8f3a5f0aec4b86722f2de01201951f4cef977266 SHA-256: 5975738b0b2c16f1a03dece3094737408a6789dd30ebf3cea3a6962e6e90dafb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. The presence of multiple links to WordPress upload directories and the use of 'utm_term' parameters suggest an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3103

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://cnex.cc/images/blog//file/13926387753.pdf In PDF document text
    • http://fujiya-la.com/uploads/files/vuvunotogoratila.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/159896907ba8accc821c0ffa649173ac/tolepotalezuwuxaz.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/16883737650.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/gaxisejejuw.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/vumisubur.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/latazoru.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/70748899310.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/mazomolunirawexenit.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2514aede---ginub.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/bubopawi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8933a4c7---totuzowufitufega.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9c76380c---vuxineto.pdfIn PDF document text
    • http://dzbnf.com/upload/file///wujupofepagojewijilemutap.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/98790807193.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081975fe69fb---35366397341.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2s802j9bhf47bb6asqt8dapc91/lefosowasuniwidej.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/gafafemo.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/pumizisavosiwaxu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd74e84feec---83831070400.pdfIn PDF document text
    • http://fittbikese.hu/files/file/25174096873.pdfIn PDF document text
    • http://raczcsalad.hu/files/83518018985.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/zijogeginawuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=irs+1040+qualified+dividends+worksheet+2018PDF 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_off0001b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B515 11472 bytes
SHA-256: 1acef4bbe6cd4c3b31b196d8e1704b904e4ef8964194ff7c124c1f138dc32e4c
font_01_sfnt_off0001d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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