Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aa8199cc03a509…

MALICIOUS

PDF

80.0 KB Created: 2021-07-27 18:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d42b18e35f628311bdccd2968d700cf SHA-1: 9dece1ef31c74f48be9539654276d5358e73140a SHA-256: d3aa8199cc03a5093760856a12bd2fbb1bbf3c4c1cf64aefe0e446350f86ad67
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 high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, suggesting it is used to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8944

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://eatatrudy.com/uploads/files/wofilalumemame.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/76441751016.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nuxowifobubaf.pdfIn PDF document text
    • http://cocoal.com/uploads/file/62923916103.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a595e31a2b---botefofetuxemugurolil.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/52b432ec4f445a585980797590aa17c1/mizobijedofovidekipewo.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/lemuvax.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/57350333084.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b64a1a2749---xawadopovexeko.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3797c22eb6bc70d2fa8704954a0cb356/teligixuzitazagomax.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b087c943e62---fiverepoj.pdfIn PDF document text
    • http://chipgene.com/image/files/20210702_171721.pdfIn PDF document text
    • https://unosms.us/userfiles/file/46913430496.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/754e9e15115a6357206d8aabea869be9/jivegaliwawoxitekajoduwig.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/82821344758.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add88e9911c---biwenesagulu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5696ccfc17d03c9c32498327f6737fc6/23374898363.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f67e430b2e9b334f589b1949df6cde3e/80205372028.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/80480530109.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087991d45734---lotasaladu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210704030227_wld5il.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091536f73319---penesuwovuvikud.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/nimijuxamegisufefo.pdfIn PDF document text
    • http://falerisztika.hu/tmp/derobolekij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=is+shein+true+to+sizePDF 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_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 18340 bytes
SHA-256: bb6dad5215fc83fe4f9f97723d0ca14662aa5a95f38b82ac84c4a5eab677bcbf
font_01_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1