Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4206e556fe3eaa…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 00:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a94739db14d0bf2aaddbf9876037db7c SHA-1: 6614f76cad792e9ddb06178d663c7615711501ee SHA-256: 9d4206e556fe3eaac9738173c4b96316aba3ed29118d412aed5a7df912906feb
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it is likely used as a lure to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=sync+clips+in+premiere
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/add634bc3676416744be64617882f608/74937804825.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4cc4f9c4---gazikebemulil.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1503979b---boxigirexenejopokazir.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/v3sd0l8vho5222nrc7l1c6atv4/31390459927.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f17f4da7956efa82d55e91ce68d27cd4/banimetagol.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e9b75a56---lifeduwatufidukuketosok.pdf
    • https://aduanaldelvalle.com/userfiles/file/9275929328.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/siemcglsufutbpp11vgum98i82/paloxofibelidu.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f0f27436---dozunuzevujuw.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd978011fa8---sadizaxujovebixixe.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/18505148197.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6a48ba6753d7182120bc2cc217e59ad2/xitepipepomezevos.pdf
    • http://stacjaregeneracja.pl/userfiles/file/95113259947.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec6da5c781---binimusag.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee020e048---satudetamebi.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1ea2d5d3dbe060c26260821e5d200ef8/83227864354.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d05acf6ab30bd8e5282c8509268679ed/nudewasoxugopejurenapuran.pdf
    • https://baxsporthorses.com/userfiles/file/7064130852.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d65de87d927---nejojelosoboxamodedi.pdf
    • https://windsbs.biz/files/file/5961524059.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/74225f8da685552e1f0cf5d68e5b8c0d/livikijevo.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a788d248659---natejuz.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ncc63nlpki0gdlj6vmrmcqt3ud/74689911714.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_off0000eca3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16792 bytes
font_01_sfnt_off000104b5.bin
8716d399417e46c20dfd881415ad28dcf2cee27e420aa5401a08484468728f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 16820 bytes
font_02_sfnt_off0001306a.bin
87ff495493cfae00b7401b455f05abc6a6a79bd82fdd24c680b90d5e585da107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 10344 bytes

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