Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56e6e43539708ba…

MALICIOUS

PDF

92.7 KB Created: 2021-06-26 01:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19ce2a1cf8b517067ada55274ccb10ba SHA-1: cdf9bebeb00d0ed30503bf68f23aa548fa27cc74 SHA-256: c56e6e43539708ba132b8d4786cf63ce8631259f1fbafa5e306754a46ca3c407
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://masini-de-ambalat.ro/images/userfiles/45740725580.pdf In PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/aqou56ofk9b3evji15ddnfvbpl/43241306846.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a67f04fc6---57591088072.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/2v1sbdgb003aq1cpkfvdsung93/86476023370.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077368d897d5---xamarikipuzosunatutoxa.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fcc5796c0---63945316592.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///paxinofemonajaxijoxepexe.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/mefaj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855bb872ede---dijolijaninajazi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b9f9fd533682bc8f15fd17e4c6576182/81912133143.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/833f28f828b48a2ef862cb2e31b72a72/dumetevijirovumosapaxal.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b607f869d7d711fa0fd4f9c64df106de/gebizo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mopnoeb6143h7jg7qem9pviu78/49720161203.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/8576632512.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/lolabase.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5b0a28ecc8667d29be66e85f290c48e6/rasavobulexanevunodama.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/36464387106.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1ca799e7---luxazibunevelipam.pdfIn PDF document text
    • https://strechybenesov.cz/content/70743503217.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d09d3b136fef5b337146d6b07b615c67/jageval.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c3068e76d6b5a979e918427514152d28/resufakidefuxa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088c8b1a6805---fefatixaxokevot.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/zobiz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b16d59fec---92444294152.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835270e1438---48666973884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=other+requirements+in+srs+examplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 10768 bytes
SHA-256: b13c0fabd4966e42f04a541fcbd5048a45f40352c998dd663ca33777e6911dce
font_01_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 16316 bytes
SHA-256: 8463cc1ae5a9386f5adcad2bb655bbdfb1aa736d3b1a2fdf1ac5c6f328a5a93d
font_02_sfnt_off00014d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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