Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51008b827e37db6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 11:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99ff5c9a765865473f79fc3cb8349361 SHA-1: 0781f2b1673b3709d58f431c8a1c61f81ffc3ec6 SHA-256: a51008b827e37db61d946c6470856c546861611c654e1e627d9bfba18e0faa13
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains embedded JavaScript and a large number of external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.6313

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=how+to+find+my+flutter+sdk+path PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613053827cb29---18565853445.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/29654381267.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/dosomumu.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/45041458999.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/71287504314.pdfIn PDF document text
    • http://fygl.net/uploads/file/042018483229.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70cc6dd55---gewejifoxik.pdfIn PDF document text
    • http://master-br.ru/img/file/lemabamegejobomijobaxugex.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/noniwupugomigumuron.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/79951020357.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/79192336994.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/gupibikifurijajeko.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/vepewetexifobo.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/54905028329.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/43197970585.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/60783585886.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8aa15b52---nesexuwumutuxubunexagi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d8be39cb---81895582467.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/joxozeg.pdfIn PDF document text
    • http://teakdeck.pl/files/file/dobawukagi.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/90770080852.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/792533295.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/fogogujajixapunatezag.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bekafopale.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nd2s48kflmdegho83ikh55cdig/matudebivevupawevufap.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/pipezaze.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379c7b2054f---24375423510.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/52949821245.pdfIn 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 19132 bytes
SHA-256: ce83edd8841075d9f1f574fdf5c9737f7b96dfa22acb6827c6db94206bec6969
font_01_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 11144 bytes
SHA-256: d7056348a4c5ca9df76af7e53e60eb57764ac1b3854e01cf541ee555e6bb5b0c

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