Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bb16e4ff223c1c…

MALICIOUS

PDF

93.8 KB Created: 2021-06-28 09:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43789cfdb486e4ef4e9405725252f2ad SHA-1: 4d57cd7f3e91db227bf6ccfd9fcfac361bcaea83 SHA-256: 46bb16e4ff223c1cffea6df2444daf2dd02a39e109dfefb6cc68bbef8b71c79d
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://pistant.ru/uplcv?utm_term=fit+and+well+pdf+free PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/r7u20vhfa96722cedkc15sktml/fereporori.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/99ef0482d265ab38ae06854816a69f54/5129338744.pdfIn PDF document text
    • https://x-software.cz/data/file/25064122764.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607967d7476ae---wabozalozib.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/nagidomominurixiwemenazu.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/38342403896.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777e713e52---xepovid.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/416f470aa9d42479eddae9e9a95d264c/xowikawurotid.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4564699caec50b669908a83747caaa26/25609530380.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/jabap.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2331812d05e1acf92da235c1e73b6f34/63624787194.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7a40e8b37fbb3a8a4a55fcb958d81a9f/25413187491.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f71196628556f08fcc3d3eb8af23c752/76300645921.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d917c48c5a4---bavujuleka.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876388791c3---piwadatovofepu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5391a7a4715bc12f8fea289d5f77c791/73284596492.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e44930c5---nezusisugebadutet.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d2513ac3dd4---guxozutez.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/74147908210.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vususifot.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fcd9ce8b4---61184446281.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/65cd30adbac255eb2999a7ff3610c9bd/34387300316.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/sorawam.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b21a73b5c93---6927626238.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 10268 bytes
SHA-256: 0333f90df7a3efd8ffb0cb003654ba3d33be55cd23b58dfebdd541151148889c
font_02_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 18124 bytes
SHA-256: 97fcd0a888af33baa40cbe1151eb80e8f3a4d24b8a66e0385f096a794e98f3be
font_03_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 18340 bytes
SHA-256: efbfac43651f036d01927d724796f7d1b93aee27056c99fb5e204ebf1a80996a

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