Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb231603a170c9b3…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 03:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 980e1a348e4859b3a23e4c46c7c17154 SHA-1: a4466997ec35a1f8be76a93b35a32ee2d467a1db SHA-256: bb231603a170c9b30f455a4e7371c20856e7b2e508db62fb432d26b00dbf9f78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of attempts to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9ted9r9g4fgsdiur306v80iq20/jobesomebimukawegida.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/7l3u2dkbbteolt98g1s8mr3mr9/12543837001.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b546ab71869---546698550.pdfIn PDF document text
    • https://cooperspick.com/files/77348644095.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/28367831528.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9d2c0d3e---52833489981.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d035907894---21579510309.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095baa6f32e5---guzos.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd617e8aebe---suvuvetexabagofuzok.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2b95d374eee5ebb7ee79495ad5dbe9a7/bujewetelifaboladunesi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/31556416489.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/74408789891.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/genakilijowavelakedelofuk.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/2ac3356ac25fbf813c62976f77493982/sijurijigatu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/muzugudovad.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a514bc84743---61239175134.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/8712117309.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/80239491091.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/47703348917.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/81dad313fe30df4cafdc4ff4ffee9e70/guvinupajesefejo.pdfIn PDF document text
    • https://noddy.nu/images/file/dawisisazazoxepenemovenug.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/mimepuraw.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607294dfc3eb6---24323181393.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e8816fcc0c090a36140048a29bd69cf7/72214664275.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5e66c0d3d70af2ee921d986d1a32690e/tasawigero.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/2724183134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=msc+microbiology+previous+question+papersPDF 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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 18168 bytes
SHA-256: c94109fe2e24e3c0469a773b055e2081da9a5a992927778d638472200f9ec65b
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 11276 bytes
SHA-256: 0f780fb09544ff4e73f88ba176946dfef3b9e073e3ef5125c77ba3cde1436bd9

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