Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b7a183592664cf…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 20:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f61b5bdce819ca6f8304f85e7e77c6ce SHA-1: a7abcfcda2c5b9a5873281ca2fd9407d28ef78d1 SHA-256: 44b7a183592664cfbd4ded425288119f79dfe7345409b02a264eb14bb6b3045c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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://smidgel.ru/uplcv?utm_term=remove+watermark+pdf+expert PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eb699e7f5---pupanibe.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ae9905599ecf54569ca3bc93eddfc2bf/repevenijatowatixu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/htkclmj43k998mqvd73nfcv7u1/mimudegezud.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/jaluwuki.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4260192a---zozawadisofogafitaxefuba.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/25395640681.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/40473818434.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/38154300264.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fb06fa9014a732c17c6c036723dd6dd2/tisirawaw.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d632ddfb2---sominosotesaxevuk.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gov27u9g60i4b6d7us3lb74gg2/30895975850.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vpg1sp2jbh6pf0pvjl7lr1as8c/72209253176.pdfIn PDF document text
    • https://anup.bo/images/files/wunuzivo.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/xijinaxitazagesa.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f69252c7---jovuwofevirize.pdfIn PDF document text
    • https://soechi.net/userfiles/file/26247597084.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3ba600026---livavobolala.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/zijixaxosexekix.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7e900e367---fadaziforap.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/57955988337.pdfIn PDF document text
    • https://nomortiga.com/contents/files/34698751718.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c7835f685c2---gisevizovodutib.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/42580925646.pdfIn PDF document text
    • https://0900107678.com/upload/file/rosupawenifitatenefogex.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c62463ec---73783100379.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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10640 bytes
SHA-256: c287df1fdd49effa316caab185430e632cf1e19fe203651f26b9884225e99a7e