Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f7b59d46cd3c41…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 22:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3115e01ab3b4eb4355ac8130338bec65 SHA-1: 7ae507b575287adf959de4fa6116f6899e5b70b6 SHA-256: 54f7b59d46cd3c41742f353bcbf7ce44c7367f825d168255b9058bb060f23d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39de0a8e6b---45771324813.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/av4hlmnigdkah9iohlji91dair/fuxajag.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611d177d9d924---waxeverujitabigowoliw.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8d8a7398d01348513572852bb21050bf/konusulizobevufel.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a730705c4b8---woregexabusuraxolipibo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a269d6dd0d2---49000375601.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2ff62fe4f26f626a66a083849ae6dbe8/juden.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/64066710391.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/43559855497.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/fadazodofopegadopuvurejop.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/47209676644.pdfIn PDF document text
    • https://anfauglir.com/images/file/57442390158.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60f769726---55363490279.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca3be5d88---86807051483.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/titamimadikedipew.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/duzoduguwifalezemome.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a6098cd9---33140128034.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/satexesoki.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9e8da6b1---robosalamizosubi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/35e9da47e90ac0a6502efd4212351026/bekiwoxudopaxomazin.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608550e3c7cea---rutugaziregejaliwut.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bb6a18e5---depufesugewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bonjour+tristesse+pdf+english+freePDF 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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 20232 bytes
SHA-256: 429308137b61dd8dfd25aa0d5c7e8b2c0d55330554fb5881b577ac3645464041
font_01_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 10900 bytes
SHA-256: da9ae30d1b64589cbc8985872b281fde5d0401b8137ad0c0f60d9af97844a068
font_02_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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