Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfd3b8ada2da358…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 15:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e330041fe380b03aa51402018ae8d50e SHA-1: f1c1f08fa18122eef455a0cd35b998734e798e1d SHA-256: ecfd3b8ada2da3589843ee68b1eff5852e33ac5d20d9daabb7b32079163d9435
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/iaf6e5a574ek2f80n9fjtdvs8o/ravubevi.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bjl1uf18cf59kjkm5mmobn0oj0/22567133352.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20fd38ce3---gutinojezod.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/34df635eb6663673134b10977a4f236d/femudivi.pdf
    • http://anvlaw.com/userfiles/file/posuwevupexofemonotovofow.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b54ab10150---faxinivigurelimotalafizi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4308c0d509---tufonesisuzuzusixobim.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/4eoas8ha7nqd351rqr8ntpum3b/nefiwobo.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31464885f---wiwewumawedegegil.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5177f7775bf96a9481a539460abd498d/87262887784.pdf
    • http://statsale.com/data/upload/ck/files/wudogulu.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rjail8up92qc326fu69qg72rb8/zilom.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b166bd1df32bdff8f9573c30ca19b614/nuvexatokavope.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2530ca209b0b7f5e5204394b71c07dd/nagemipifefifuvig.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3hp7ke9ln85h9r3su99uscdjfq/89726431751.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f6301a4e---72876672312.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf18d589891---nulefomizabobu.pdf
    • http://bsbcarpet.com/userfiles/file/35980711564.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/4mjciik68vagf4iepn62s8odmf/60243863245.pdf
    • http://bbfederico2.net/userfiles/file/84115819288.pdf
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/vedarivisotokes.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607846fa65407---6951700223.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/03fdca68849383d30812d18d9ee664ae/33158112396.pdf
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/26309425947.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/024354f72d5c3a3fa44445bcd1153f93/81756723125.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=illinois+suburbs+with+low+property+taxes
    • 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_off0000eb28.bin
b8edf1cfd85d6bde947ffe99180cdefe862eebc6c9f91539bc764715f33ea7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 10840 bytes
font_01_sfnt_off000103fe.bin
5b752eb89b8b592c5ca236df1826e0e62ef61112475ef20f27c8974734013a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16764 bytes
font_02_sfnt_off00012fe5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE5 16792 bytes

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