Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e6e9b92382af01…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 10:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 963e058ca94deaf211597d4713d2251b SHA-1: b8af57d8bb64aa32ae22e8099d5899fa584d3e94 SHA-256: 20e6e9b92382af01d40eb70720ba68a0ca1bc8da2121cfbc3bb64bb51003e928
124 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and other disposable hosting. This behaviour is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3974

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://studiotecnicoprato.eu/userfiles/files/xufibawejepuxe.pdf In PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/63634884222.pdfIn PDF document text
    • https://migger.dk/userimages/file/gabunezofotuj.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcda35615d---metokokido.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a143719fc20---91589434391.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99eb321c9---61214483650.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42d8ec468---30056435038.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c22aa3f908dd581bf65b47f42d06b6ea/borototafowatej.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/fibikuzib.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tenusotar.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/60600184506.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/ralajipurepijatetuvani.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/19531738324.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/66998114859.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e957996ca5a---35874992375.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/84632373089.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/39553678375.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3821859f0c---9343233992.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5658e4e906b42a3135b0dd2ad949bb32/23231292356.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/73521552798.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/1370500123.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607928a74cd80---kidizubopaxopasot.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4c749e547---968302215.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xigotuvifipar.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210828181309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=four+color+problem+in+graph+theory+pdfPDF 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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 18772 bytes
SHA-256: d751112555fec42be8abcdbc3e3def8521caf1205d6cf4e7dfaf98da49ea59d6
font_01_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429A 11228 bytes
SHA-256: 4616c73696aab05ab847cdaa8ca0035f91afde16dae3adb0a3cff0f85d1dde9b