Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eecd9e25df717c6…

MALICIOUS

PDF

89.5 KB Created: 2021-07-01 00:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 770df22f1499515f2fb21d7c7da65ee8 SHA-1: 87d26131d83a1363e354118e8a6f78dd15a434b7 SHA-256: 5eecd9e25df717c6cfc6ed85222a3f68d4f15a45c2ebc9486e20d179db109bc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attack pattern focused on redirecting users through a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://chinoboxingclub.com/clients/36032/File/zuvalatudutufuwetezagop.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/826466abe4977dd894ebe20469b0cbf8/88698437567.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01m68o0imiu1q12umntgjb3a02/85952971305.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a35b651ab3---pumagotolene.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7da2b90d75fa716e47d1d256b9f39cbd/82841201268.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ststg6rj1nrrlvj92kkk54vp9d/88809871939.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041277b398---kenojixaz.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/xofirumisevatiwofofutod.pdfIn PDF document text
    • https://papiratisk.cz/soubory/zonibalomufugedesuko.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d75e3fed6---xizapigerujegi.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fivukoluli.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66fe66dfe---42088644035.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/52505241492.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b602c57a---serumonikewodegivegiz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1f7ec1716---wozeru.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed315e3ba---36789701770.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c37d3b25cf---xebubizufovawov.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160700865dd8c8---81276252961.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb88a5964---8194349251.pdfIn PDF document text
    • http://slsnn.ru/content/file/26365887472.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/mamirufafivogaremafufajog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=introduction+to+automata+theory+languages+and+computation+3rd+editionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 17284 bytes
SHA-256: 2d94cfacfd9b8fbef17e5051639ff9d66b57f3c0b005cae9efcf0dfb620effb8
font_01_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 11296 bytes
SHA-256: 4dc1b5ddf81bd3bd6fa756e3e425ff18dc7cd85fd4bc517f3ad7165b8fe4a7c6
font_02_sfnt_off0001359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 2260 bytes
SHA-256: 1036d9570df0480abaa39b5a13370674ee9c72db6874dbaba2311b331abe3007
font_03_sfnt_off00013fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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