Malicious PDF — malware analysis report

Static analysis result for SHA-256 1234748f18a9caff…

MALICIOUS

PDF

86.5 KB Created: 2021-08-04 01:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a5f7dcd4238c9e8c59d96731a917d5d SHA-1: 4686982a276b47f6a3a0784751a650398de41bd3 SHA-256: 1234748f18a9caff8c9c8aef8b77c95f0a0949200312acb9448d5cdcb5b707a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and link farm indicators suggests an attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=tafsir+ibn+kasir+bangla+app+download PDF link annotation
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/mubipazifenovebera.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/4a890c5fe33bd8e1fd1009f8b89ab18c/93697866270.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wigagukowufimawumomojizo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160722a8ba9d65---nukuvisegizevezibuz.pdfIn PDF document text
    • https://icbacademy.com/upload/files/geveluwawin.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7fl5leghflqktok94leppmd5u3/pagotisaxom.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9064da0959---gakupepuruvedagoju.pdfIn PDF document text
    • http://megalaserasia.com/upload///19450565326.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161060da884731---34121298452.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/dunizuv.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/19495344578.pdfIn PDF document text
    • http://maksimetall.ru/files/6074132825.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5efcb327d89ad117f3fb07a8297e4547/57063927765.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/7b31469ceadc4b3576089c0faec6c284/mowumewufu.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/17036081079.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/37515133406.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a8a5a262c---tazupotunerixerir.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/sozilatap.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/xizemoxedisulebegoge.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021060205172070554.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/rajimo.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/33546981100.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c472a398df---28228985506.pdfIn PDF document text
    • https://digicpictures.com/downloads/13164856552.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ip8oj42c69254belvk3u8jf6lb/logidome.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 10724 bytes
SHA-256: ed91eecb8707f6058c45f8bc347d1b951ae0ed4535b380105bf95a4ad073b841
font_01_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 17360 bytes
SHA-256: 883ececbf65b7ff70749c22f67427d7c5a8dcd00be7da2b34feeb67f39d794bd
font_02_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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