Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e51ab7c7709239d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 23:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d6eed2747c47ea3128a6c01dc02d2da SHA-1: d032377d929658414aceee540d72fa43a34c12db SHA-256: 6e51ab7c7709239d694a2aabd80ee9ba869b45f0aecb12d4d3c86cbe04f8e9d0
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8389

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c748be7ea19---30111464690.pdf In PDF document text
    • https://legend-chang.com/UserFiles/files/30046094051.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/98841416783.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c09d3f06---12887605112.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/16181515713.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/96519690720.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd93a4397d---52589529316.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c87632401---61530852760.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/gasowotiga.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/vowubikubivabudo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/8893696240.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/66877713121.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/uojs88ss9hae71dj89giglu74v/wazeluxabu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/102333a12e5dd0b760a01b3e0a2b0a69/69362385626.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uh3fd2ccqk68bj6vlvq3cas4h0/kefudapigonexesonin.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6ae45b9d6---71235248358.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7f432ef6e8b2661b036af8d11ba8431d/veseletejenuvaketaxob.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/r7nulallkc82ccbgas03caj0c2/dotusujerilidonef.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/15f064b36aa6d6855b7f11ff57b5723d/bemugere.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/42c0efa9578f9def786afffc726f72b5/98393971039.pdfIn PDF document text
    • http://mfcpavpos.ru/file/9886069674.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5uvqtlpb30cqnpv1eo4ja3c8p7/45278104495.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9b5554817de997043064eff5245da255/ladofolon.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a4396479---57669125354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=extraccion+solido+liquido+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_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 19068 bytes
SHA-256: 847819b3ae4ee6ccbd4dc52e9d15d9eb2a42965235e73d4c2ed931401962aab4
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 10812 bytes
SHA-256: a6dc682d6d755e32d8a2278a58479ecfb8ced95be16711cc044c3a21b2530719
font_02_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1