Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc86e3e679edc5cb…

MALICIOUS

PDF

104.4 KB Created: 2021-07-01 20:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2f4e5422735f946acf398eed6a2c684 SHA-1: d0bb2c560f48777de09e3b2c45002a0e9768f5d7 SHA-256: cc86e3e679edc5cbe2aa66ef139d294ea454a3d03c9865121921e7bacc0c9e9c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting, indicating a phishing or malicious redirection attempt. The PDF structure itself is also noted as a link farm, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nomaquito-travel.com/editor-images/52711877067.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b51b1eaeb6f---jixajidumekefolezomiku.pdf
    • http://rajskiewakacje.pl/userfiles/file/91225936683.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/gp30b43p40q80bnhmggdt0aqsi/fuxojarorataluzumuw.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d6b259ec9---rovojaluvu.pdf
    • http://narcisse.sk/editor_uploads/files/42977975649.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f780714e47---lopaxe.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/bd750a8b174b22b393cf35944622da0e/jelovamosajexaluravan.pdf
    • http://zhengfutz.com/v15/Upload/file/2021611456452305.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acedabd4ea8---58921289132.pdf
    • http://gomientrung.vn/uploads/image/files/sisugexujoxaxosakefowe.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/83e2e0ee3cf3f7d459edae7593ade40b/makobekodukoxo.pdf
    • http://anthonyvienna.com/sites/default/files/file/96996051034.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a332fe2919---49143473145.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0d7adc846550aad2167fd783f69e2fb7/ziragumigutuketemupo.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae6de2f51---joxawo.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eb9b172e3---90725236545.pdf
    • http://mai-colle.jp/userfiles/file/modupesavezata.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094141295afa---23725700885.pdf
    • https://liniagdanskzydowo.pl/files/waderesodup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=statice+flower+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 16792 bytes
font_01_sfnt_off00014ad7.bin
70e2dcfe9878cf97ecb10d1a0f644ff8ebe6d58939efaa5cf3cbff93c2c5e5fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD7 18244 bytes
font_02_sfnt_off00017ac2.bin
b2aa4fc1ee59f8599f32f5bf92bc6daab3866969ff6141b0ee9946daeb50375f
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC2 10672 bytes