Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e6f88d01250c91…

MALICIOUS

PDF

84.6 KB Created: 2021-08-05 09:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6bf934e164cac556da07083a48085f02 SHA-1: 4327721d0cd0568ebacf328813350e3de1801ed0 SHA-256: 71e6f88d01250c915455ed359ef31700732b92e56f60e6f78e138d7c23116676
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8448

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://rainbowcaterers.in/userfiles/file/97550668713.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/kudfkk840vrh8p3mlo30ue6ne7/25954383257.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/biruwuxekosakog.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/d620n5ciqv1mj8vugladt62414/siferozebubidakuduriz.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/norudimogo.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/galozezasawuguv.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/2258524491.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/wabegurenitede.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093da4c92d1b---liraditejaxul.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/c8n9pfnjd2hc5dvd7vt79150u4/sujipazumopukunefekon.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/74213b912f9a63b570d6d9da6b05e765/tedigaxidujanexabujilu.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c59cc10adf670f2954aa315e0214f4e/28976253883.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/xofasebafudasosi.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e85d5e05d3e---piwev.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/wukugogubogoverujaxawuj.pdfIn PDF document text
    • http://funperm.ru/content/file/91573737072.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ebaa1c36---51952041370.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5ea2ac0ac0b99c3ce548b0516330ef85/mibodegowopekijawar.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/20303f57a550f549078073d27e941a73/fenakaximuwafodot.pdfIn PDF document text
    • http://soupworld.de/upload/file/40451454632.pdfIn PDF document text
    • https://alutat.com/data/file/dowewigibiporekusuj.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/nefefege.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb063bbac4---fojezawevipixazo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca666c74df---16739322985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=why+is+the+prevalence+of+celiac+disease+increasingPDF 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_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 11072 bytes
SHA-256: 3efada7ab77ad31578ebcf54275446d8fa7ba1214a8d6eec674deddaee29888f
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 18280 bytes
SHA-256: 2731202ae5122bc53e45a0582a985cefdaed7fa47d6174845d4dedd286c3718a