Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd623827d9cad5f…

MALICIOUS

PDF

88.0 KB Created: 2021-07-05 13:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4be1ded0de43b48a70a440328007e89c SHA-1: 40e9b12077b64c2a6f650df966415f7d8c9361db SHA-256: 6bd623827d9cad5f1c66987167f3ca5cfb1f3e8c104a6f4e6a216bdfd1fd4e03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c348d193e5d---senitemebobugusi.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077bcd56aae5---pupezixugenapelezosof.pdf
    • https://werbemittelag.ch/upload/file/tevafuzulexapapexo.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba15c5d7947---dubidaninitubame.pdf
    • https://wickedcheesy.com/images/file/sagepoxikuwasategu.pdf
    • http://libertyquad72.fr/userfiles/file/najetedod.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da015710183---noxazuzosilex.pdf
    • http://jun-travel.com/userfiles/file/1602033705.pdf
    • https://bmw-zona.ru/uploads/file/zawuxe.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210529092830.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7acc50a2ef47f5dad31b94dfccfade33/depabuvumolefadipogefe.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ce594d22503---wuwegeluzezesuwazogamo.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afce3383d78---bapuzufafubo.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbac53a75---bonaviki.pdf
    • https://vmwarts.com/ecovic/file/79567141122.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75a3f74581---zoxupu.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/eac52401da2673353a3fa6db0fb221d1/raruwebiruwukilebozuzivu.pdf
    • http://bigband-ulm.de/userfiles/files/48262643153.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cda8aefbc7c23abcabd64c37304bc3e1/duzusifiboniposagopumo.pdf
    • http://adance0112.com/upfile/editor/file/6525728649.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/kuvulegixo.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/kcpkf9aj6vk8c48bsc4lcbn2t6/wujozevumafotozutufus.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b623ac1e95---vulutevexitila.pdf
    • http://autohondl.cz/userfiles/file/37749834575.pdf
    • https://szekszardportal.hu/userfiles/file/29783997053.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=giving+a+kidney
    • 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_off0000f69c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 16792 bytes
font_01_sfnt_off00010eb3.bin
e69c954aacd950601874f3be292483d0fc001bf3604f625a212be691ce216544
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 10204 bytes
font_02_sfnt_off0001257c.bin
cdc78696e4e3c2e7bd5695fd7f970748d0ea2ed55e4ecc1dffa158ec01569b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16964 bytes