Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc0b2c7b84d36cb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 23:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3734e801e53eeac0dffece746aad0f63 SHA-1: fe100d4ed50fe277314a084f1f99b2105e577ccc SHA-256: 3bc0b2c7b84d36cb9b75a5401149c39fbeede7a6d9bb96624b868de0283862bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on compromised websites. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to download further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8389

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f973edca1ea5867e120ae5f9d02b5680/xajevoso.pdf In PDF document text
    • http://artattack-concerts.de/files/file/64597460413.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/40639369793.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/57008808772.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/88556526537.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/gukewapivojotogasobuli.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ca13d21b---51654153282.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609034d4b4a14---54384134021.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/74305777283.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/11278584912.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf7837816---xolezivopeketuj.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/xijizitosanofezoposevuxor.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/fa07cd35fe40b7cfbad082453ebca492/8075570544.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/rejagatenuzuxegev.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/buvemoruxud.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/501a3d0a4e5a80836b7523c2ea1474b5/rojaxejudapakos.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/46213877404.pdfIn PDF document text
    • https://ksboutlet.com/file/files/wojonupeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089276eec02b---kasagir.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/53754266224.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/30957850125.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5tn6p3v1ub0d8t2sp1u2t5mlj1/72952708510.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c3e11949a15c0915db5ac048fa6a8398/dakilaluganuxugikukitexe.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wuduve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=leave+letter+to+class+teacher+for+absence+pdfPDF 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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 17640 bytes
SHA-256: 80314f31d53d5333619329c01ccf7e70bd59c5cf754e6694c47e25070d989d87