Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fcb94077cc0176…

MALICIOUS

PDF

73.4 KB Created: 2021-06-29 21:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8e75b9d0b2c05df186f99e4dd0f2957 SHA-1: e30a689decde759e208b404159903bac030590d3 SHA-256: b4fcb94077cc01761e473ed70db0b00ae8ff2ab14619838b75cd0af4e4ccd9fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6632

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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/e2shauam5vumjtv86bikrh756m/10188915446.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/p23hkqgpr30k5l9801nq1rhbc1/87168394085.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/nerogofekuwuvudevodu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340f92be34---42447599356.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/412ff4fe0e4e9ef7a6b405fc83e444fb/62056771567.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/dizafapowerowokiva.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sv4k9m8fvnfukkk419bidgn232/11299024437.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b38bf026161---17227975394.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/89ffd4e30525d1430e9876ba94537468/74735442641.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38f1cb234---20838047993.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/13188366519.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4bc772cb9---loveluwutuwasizeno.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc5d19632---26180647615.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/56915521936.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a087b05a02---38263210600.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6bb9060e8a83395b05d63bbaa17ba6e6/40457471234.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d97b4240c7b---loguxezunugo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/84c330c91db5352e44105231698c62f8/womuzijejazubupenuduwaso.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aee2077670bf32b50ad5077592b8040d/64188526051.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d062c7e20---76750438448.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/34vumtm5i50va4hl7ku30rbcpr/62007868291.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b8035e47---bivufanoziri.pdfIn PDF document text
    • https://bczenekar.hu/files/file/50268303812.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/kakomu.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/gigenoxobivogamatajal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=apmp+questions+and+answersPDF 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_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10820 bytes
SHA-256: ea65b3e93d63538b78d809fba498af4e6f07032fef2ed5823bfc041e1566052b