Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4b4c9f83253f97…

MALICIOUS

PDF

102.4 KB Created: 2021-06-26 09:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59aa7ea33551d731adb4108e78042ad1 SHA-1: 6bff7ced90909060002ea629edb630025324ebcc SHA-256: 4b4b4c9f83253f977555b554aae816d2c275b39f866ea0546bbd13807ac53360
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, indicating a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://csodamalom.hu/files/files/wonudosusadiza.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/s7ccdehu7g6cj2iubpf3s0en36/nubopujajilogapanifufanur.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4783d7cd---38999551666.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160786838e264e---panivexonatadoxo.pdf
    • https://arhometutor.com/userfiles/file/musuwurukasuxijimefim.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29365d8805---getazilujeretekevemomip.pdf
    • http://marcelponjee.nl/ponjeefiles/file/diwolixikuvuluze.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a751b529b28---kipupozemut.pdf
    • http://daiichibus.vn/uploads/news_file/50574114671.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16080942c4a64c---52280591138.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/201f5bda40eeb77ed78caee3f61f020b/larem.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1770d451de2ea9abb32db97fffed2764/tulake.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/04cd68302406331339556d579ddf97eb/34141044823.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9fbe1bc8cd1cfb9bf73bb7d23ee2eaef/tekawamosize.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef053a2ef2---tisixijuxifof.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e62bc64f---62639790732.pdf
    • http://fipjp.com/userfiles/file/96252500759.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9ssd7qnviahb8irfjtge26kao6/26053252598.pdf
    • http://agrobud.net/uploaded/file/87408584161.pdf
    • http://africareview.in/userfiles/file/79181654596.pdf
    • https://lescourailleurs.com/upload/editor/file/67029264752.pdf
    • http://andlupa.com/userfiles/file/fuvalokonativabisosimit.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6293496748---sumadumatizogowizavaxamo.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608db25590017---sepomukolera.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/20c98f2cb8ff18c0850003fa9253a1af/tuxaminexuponoru.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wise+and+foolish+virgins
    • 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_off00012d12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 16792 bytes
font_01_sfnt_off00014524.bin
b622a9bca306546878e23e51200d630f97c0a79847776e2afd82cfd82bbe7142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14524 18284 bytes
font_02_sfnt_off00017472.bin
7b1ba80b4183555cc5a9f93c93b2147d0a821fd2eb49de847daba2b9acb140d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17472 10596 bytes

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