Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1e8a4c777c9eff…

MALICIOUS

PDF

89.1 KB Created: 2021-06-27 23:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 998ac4cf5079c31ac3320c17d75f8a51 SHA-1: 72036d9b1cf22f1d8bbc4a6450784476521def1f SHA-256: ad1e8a4c777c9eff33079b5fee95757e08cfdcf24aa4798514d1edef4cd8e971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and other disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=are+sea+turtles+cold+or+warm+blooded
    • http://qca.ch/userfiles/file/siwumasug.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a2727534---52324869393.pdf
    • http://savvyais.com/userfiles/file/fenuvapuvar.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2i3fr94s6fc2movn7p6sh5a60/tafikefimele.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0eb960e38---nelaworibezugabuliz.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24d637e7c---25364388842.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f885ca2c15ad2c3118121aa1c0d19edf/wufumorowiv.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/abf26d4143ae998fa8fcd63a0636d10d/dazubiz.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd3047ae6e---fazafegafo.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/cuf8b7bp8o4p698qq3k7rhlcgf/wumiruforupugej.pdf
    • http://eltonltd.ru/sites/default/files/uploads/1041462081.pdf
    • https://booknowrentalimo.ch/userfiles/files/boludegaka.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec203febf---93768587112.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce42a62506---20537928876.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608816a7d0591---lasefimomisubopad.pdf
    • http://okwmd.com/upload/fckeditor/file/valexijejimijowalulan.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/6d22d779dd7d75a76243063c6de6e78a/33351303665.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f57456b6---zuzosodutinem.pdf
    • http://techscreening.com/userfiles/files/30876851016.pdf
    • https://amblamy.ee/upload/file/rugunizulurovo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4e7d032ac---30591116732.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/motozutagimasovupavigunuw.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b61dca68708---60069570214.pdf
    • http://jakpaisanestate.com/images/upload/files/xuzedunukimax.pdf
    • 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_off0000f629.bin
6c06c1a8146b9a8ff1637edcbf68b566f7b32550ae7b5fca4e3d873bb94a5e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 17776 bytes
font_01_sfnt_off000124d8.bin
0518006fa43f51336073408f254198e1256e39f55691dac79fd5c05748575cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 10644 bytes
font_02_sfnt_off00013d6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6A 16792 bytes

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