Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fec03164e5b3fd…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 07:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1da0f803921971aab07fe677a944b5c SHA-1: 604069b9c7ac2e6fee655da323ce3dae27703748 SHA-256: 86fec03164e5b3fd364bf523ab8fc21adf5b7a7992375ba60070deb2cc76c55f
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true destination and potentially improve search engine ranking for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7974

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 https://relaxbotanika.cz/ckfinder/userfiles/files/63027928913.pdf In PDF document text
    • https://eliteplacementagency.com/uploads/files/93712070402.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8caa4b88c---99198248248.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/27vblf01rmrkp25l2h828tqjl2/23803778718.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/gawodalelizasuposa.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f95a5793---97009377427.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d8d9c05c164deb1e426742d8cd72096f/87167993589.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d56250161c18c241bf2522eb9f5bd485/xijidozijazebixidefaxur.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/xebosisojawewixirib.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/famamitopewebebepetoti.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/fikapeladi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16103048571f54---51084573564.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/76409099585.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/oa7atdb3ehh3pte82h21ivcat6/nufowefuwetinijerusigos.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/vegekoxekiduxu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1qeoj48s9t7ntjfm53uhb1j2ro/79293792319.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/rexiwuwajulizulafijiti.pdfIn PDF document text
    • https://jotelek.hu/files/file/vupadigo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcfb62e61---zapixinamazixaxilad.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/97858799071.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g550a8vh5mg6f8srp25t7ek1b5/sunuwuvojagad.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc7b1ec8eb---69169583071.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/rasizejozaxuj.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d1def4f6---86747185128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=define+livelihood+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 22644 bytes
SHA-256: 472157338c111784087e2c6bd4a94a04ec5a62b221de902a31a94224a791c775