Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba9563cce1b3b3c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 17:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac99f957a0c44c8a8769ab3d6ea2cf7b SHA-1: 21dd6b888c6e43a44261c99d5915a007e52dddda SHA-256: fba9563cce1b3b3c17a5a91f7f3ddac30a41e1a380647e84b30772f82cbbbe25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures that often leverage embedded JavaScript for redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://imaggu.com/ci/userfiles/files/86919671119.pdf In PDF document text
    • http://lobi.md/userfiles/file/81411290729.pdfIn PDF document text
    • http://henca.com/files/details/file/zexisarosezoviwexe.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/wezovifuxujowaroxakiwison.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/risukadefuwogerovani.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/dafisurugekirilozus.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/loboleven.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6742c4d2120d660ac0b45e9005868600/97288453675.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/17997494609.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/bosuzivalunibiwaronawawop.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vijitapoxufigebe.pdfIn PDF document text
    • https://blugarden.eu/file/nuvapilaxujugi.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/24889223028.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/280957295.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421e5b9f833---94279555472.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/pawuwilaxozexarobad.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zisifivesel.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631236246981e7e68ff425e519f3.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bafe9ef21ae845c3d71b300db6f85f34/sufun.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021971736115403.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pqpqoamg5t5rrt0730bdajdmd7/34015359449.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/75839414728.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410118d7f3c---tonugefurikamo.pdfIn PDF document text
    • http://drtamerturan.com/file/93625340023.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kubuleloboko.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/65879358248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mp3+downloader+free+download+appPDF 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_off0000b3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A2 15244 bytes
SHA-256: 4a4e65cb0ebe08d39742d02af13fc45d4c2938237a5429a6f76a2959a32c27c1
font_01_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 10384 bytes
SHA-256: b20b2c9048d6c36ea8dcf873545ca11b061ed1fd18b26a596fd48529e227ccb7