Malicious PDF — malware analysis report

Static analysis result for SHA-256 2323cd1f13a1b29b…

MALICIOUS

PDF

77.7 KB Created: 2021-08-15 04:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f37f11a1a65bf66c6d25f5c105e73b7b SHA-1: 0ddc6a7e7cde0132291d4a8aa9f83db6b51cdf10 SHA-256: 2323cd1f13a1b29bb2777f1714fd7d8446bcac7596976a2823801f5bcff3639b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, presenting numerous URLs that lead to external websites, some of which are hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=how+to+become+popular+on+zepeto PDF link annotation
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lm9f4dfnsgnu7iqmnf0l718ilp/4474707895.pdfIn PDF document text
    • http://santeh.md/img/files/xiwadi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/wamogunolodunudevovomasun.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/lewukexevigiwawizitunap.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/96401268389.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/16023630451.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/i62v61ophjavjni2jeberjvkth/81288194833.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e681fd2139---64392340935.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c77601794b88c4b4a7677242b357653d/19430370701.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c470979e215---41114299728.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/99064118636.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/rafuvuterazamalupasaxi.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/podesafogeziraxefuxomeje.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/loxofumuzogizanuwesiga.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/96833458522.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/44887996161.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d4160f8---12901819028.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/6258744854.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/kebotigodoz.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/rr7kq0pvrvcp7oaaou46qpcalr/zedaguwosovubujimizolup.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/14347664611.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/71790958028.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/47e8555c326da724d9511b9eddf13bb6/95494463647.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/vjo691lou7n22b60hm52ru8i92/pozosimi.pdfIn PDF document text
    • https://motherboard.vice.com/en_us/article/439nyq/zepeto-is-the-avatar-based-social-networIn PDF document text
    • 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_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 16764 bytes
SHA-256: 60e55c48c10b0893e476bd1799dff18edad271c245b77b0ed51ebf7b24c7d49c
font_01_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 10652 bytes
SHA-256: 4ede1c54744b871157991844a5a2a73c02c715bc69a3f883dfc7a4695a1a7c6f

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