Malicious PDF — malware analysis report

Static analysis result for SHA-256 809987841710a077…

MALICIOUS

PDF

101.7 KB Created: 2021-07-09 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4fd413991c2f604b31255f77ff5c4a14 SHA-1: 931f181e259ddc8aee159be3b03905dfaa0288bd SHA-256: 809987841710a07768b1332d377c4d340d27f813ca6fdbeb7bf18b708eb66716
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://circuitoinsulargc.com/documentos/file/rawoso.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0514541a73---nuxovamemeporowinovixofa.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/napezazovupofiw.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7dc052812---weluwevumagunijepowug.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a7061c2f28f16f768f6bb1249b54e661/nuvogitike.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2c349804---96863862190.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/68756810682.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/s331rj26aldk7gsf1qf27c6n8h/pidisumugiwevoxoneguv.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/ca48f7bc77354278f413a2ae1a3de5cf/wuxiriwufuwenejevim.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/xemafaradudox.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/vudonagadabazom.pdfIn PDF document text
    • http://fedoro.ru/upload/file/76847101098.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e76b6a13---girelamakeposesewapot.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7d7301fc---nopibisumififizomalijojid.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/jorexibekul.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a3r0h8p7hbh4ak1eo02f3vk6jo/senazela.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/532d6e497f7ad5f37fd6dec64f250843/93823974696.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8390935f50fa3e811b4e89efd5c27944/zixenoriselijixulubu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a8335f0d---bopolejezo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/48438298686.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/89044548831.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086203c9dae2---juxafuwugigulejotafa.pdfIn PDF document text
    • http://proxima-design.cz/files/file/8509355066.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64ad3867ef---gerivinosedibeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=theory+as+liberatory+practice+bell+hooksPDF 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_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 17692 bytes
SHA-256: 0fc00c7f65a7e9ac84f620dfc6d7809e08adbe43c9bcad7a19ece10550113749
font_01_sfnt_off000158f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001710f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710F 10676 bytes
SHA-256: 38de93bc73f64d89ae5cee4f1af7dd71d0472587a0959455eb097e38e873f115

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