Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c1539a289cde60…

MALICIOUS

PDF

100.8 KB Created: 2021-07-04 07:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8c66654b6f13c5b1c760c2f6be678a2 SHA-1: 2ecaa059564a5e712d9f78c879b7ae3da04856c4 SHA-256: 21c1539a289cde6003420e3ebada2f487a8d9c7a9ea1d824fabf9d6a84d35dd5
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing lures. The document body is unreadable due to encoding issues, but the presence of numerous links to potentially compromised upload directories strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9af9e1177e---94896379482.pdf In PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24042a6350---tetepegojoseramoxe.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/eoqmht01a33nbs4dmm00shrgvr/nekalunejug.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5180c009a---5719596942.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/71769006859.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/99214982139.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072baf35a68e---lojuduwadozojoweniv.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/pamugoloja.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7d3c087c60115ba83ba44ebdadd16e69/tekepifonorubog.pdfIn PDF document text
    • https://partnermind.cz/images/files/ledojobexigawuxepekaluj.pdfIn PDF document text
    • http://jngf.cn/files/file/jabasodelonizuxutifared.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bamujddvhjl1n4p7qs1f0sgeg7/nokuvubuz.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lejokivaxumezegurereziv.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/20s2ceh8aqernafgueo8r5veou/44680896214.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff47e78f4---nusat.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b9ced38c85d9ec5d1009053c1b30e7b/79087925647.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/043792aae7406b8e1d0730b7bd2deb23/sagadulujawedisobigarum.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdceb31046---vexesogekanixijo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ae689480---48832780305.pdfIn PDF document text
    • http://imaginove.eu/data/Files/81736381289.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b316276f126---piwewetuzo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd0dccbc8bff13eab4381e837aeddb1e/gotipitezor.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/61231c9d529972ab1c7cf0c4d12853ce/lepiwemoxenamubisugegotoj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070e14205634---21298967652.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dkqea1iu58bsufgg9ibv2i5m7p/getupiwigulatoxipelopibup.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/jerozujobotazuzatodeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=for+air+to+enter+the+lungs+during+inspirationPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE3 17548 bytes
SHA-256: 677113b525a2438c247fef4033e7b265c09bd56849dedd3682bf185d0fe2972b
font_02_sfnt_off00016cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC2 10748 bytes
SHA-256: 420d78dda3d27b305f6d08b61d446b1ed2a7f73da6738857468981a6d7675f45

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