Malicious PDF — malware analysis report

Static analysis result for SHA-256 116c7a2cc52e6ea7…

MALICIOUS

PDF

115.1 KB Created: 2021-07-07 01:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6be6f0a8a9d3d3174463341b3a89de94 SHA-1: 87bade3b8782b1552f3085855a16d481ed98e253 SHA-256: 116c7a2cc52e6ea7ae7a7458bbd0792276c90753f4a50b794722a2b1b0db42a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5f24193e6d79b85810624dc5afcb21db/19063166629.pdf In PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/tilitinatepotulezijox.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3cbdc045---60472831453.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/rurisiporejam.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3640bafac6---85283583010.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/72533820950.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4fd6f1d7c---depexisagugogunozuj.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785369b1e60---geselukikesobeve.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/i6o3jud6a7sr3va92d0mfiafpa/84474622047.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/bd36788656742b0fa67afcc40efb92e1/tajodob.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/zonatigus.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/4935240878.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f2aa4bd8---bedokimawi.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/q48ek7v96ofpg3hts3t4a9ppib/sijovina.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zukixaxobefoze.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7894405d4e3986866671a5b046ee99ac/tuwejimesuwinemito.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/mb1qa791b6g8hnf4maitcosr6r/zafojasufilowarakuj.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc659507cbd---53990411279.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sibubinusowifez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a413ddd25e2---rofimubebiledaxapajodesi.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/35750326584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=global+multinational+companyPDF 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_off00016155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17967 17104 bytes
SHA-256: c05502eaaa29091dd337d43f9be7c54e81da392aea56c95a242abcff45aac051
font_02_sfnt_off0001a60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A60A 10528 bytes
SHA-256: 4f20cee1333310c137a68cb850106bdee82fdfa89a78ea5e4e7ad797a2094ae4

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