Malicious PDF — malware analysis report

Static analysis result for SHA-256 605765b6ba39885e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 02:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99f37ad428666a391bed69ecfaf8a65f SHA-1: ab939113ad9b4fe9ae01205969a63279bf3ad7c5 SHA-256: 605765b6ba39885ed594fdd2c0b81ab27157976c2fc6e11a326477eb852e1f20
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised WordPress sites and others on disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7965

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://secureyun.cn/uploadfile/file///2021091320335859.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5180c46698e1de6abff6fa1331bca157/26804965958.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/40946417404.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/18329990974.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/17103126761.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210903_FC29F4B278A9645B.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/dufazewa.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/vewujex.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161465a947afce---96208121058.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/3464688695.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/fexiwedax.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161431a1ac2e06---mozila.pdfIn PDF document text
    • http://rc-modeller.se/images/file///jibabakudoxesaxisivi.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/95144934418.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/84836428587.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/39406780.pdfIn PDF document text
    • https://airbays.com/userfiles/file/56755875974.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/43711506296.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/mekibowin.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/46311198516.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/9218494072.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/xelufoxafeto.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/56285511502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ig+comment+liker+apkPDF link annotation
    • 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_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 10592 bytes
SHA-256: 2fa8f95cfff68c5f193e3fcb60fff4c4b7bd177395aa90783333c7fb147d71db
font_02_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 17884 bytes
SHA-256: d80bc964d79ae6fbcd073574739abf3382c1f67d3889269a6b26ed36b3ccc5b5

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