Malicious PDF — malware analysis report

Static analysis result for SHA-256 487c91db92fc7daf…

MALICIOUS

PDF

112.7 KB Created: 2021-07-05 17:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fad96124ff515dc0c0d298191a8f6796 SHA-1: b800402c0de05909aa7a991fc28947327f75c3ed SHA-256: 487c91db92fc7daf855b89495f093f5429cd4b10824a6eb12a1c67e21086b9cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of a link farm and the nature of the detected threat align with common PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 http://mygotour.com/FileData/ckfinder/files/20210606_75EE814AA0FF04BD.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f6737b4d---lazaluz.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vtralpsv925tmtmnipfnrf6fk1/70313498019.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/a255fbb5f59bf6eaf4e52ce741cabf2c/zipudisefenebow.pdfIn PDF document text
    • http://www.bandungmesin.com/file/jixiverakajevujirufiguz.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/98298457329.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8eaa1d18---vexerofujesefubofopajez.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106291312483918.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/zopexebovalijogikakep.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/62583743508.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/gekuvakipufetizafo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6jl50459hnm6v9uak263uqbn71/lewilovot.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dd62354dc99---55846063762.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/divawuziwegawugiwab.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/73975130237.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3592ed98f---pafijavapufuwibabolu.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/xuganof.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/jofazagi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075804638104---41697875235.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6ir4tk5s6o49k4hmqv15agcp8b/52117920745.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/bimulonefisukurimotaleg.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7eqekvjcev7eh8v4vs8mct684/37749646625.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9c380aad5---71194603855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=disturbed+the+sound+of+silence+livePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 10720 bytes
SHA-256: d3184c2b23f11c4bb7cea72c3c0d4cd7dd7c29ddac47753f5a6ee139f57fd9cb
font_01_sfnt_off000153ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CE 5540 bytes
SHA-256: 783a5d5b17128b689c8681f21fd49a5246889d4b3f73397a15fe0dfb10fcc4f0
font_02_sfnt_off000167bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCF 21056 bytes
SHA-256: e8a1609eac3c130bace716d0a40ee84286032b54ab573e11e8edc81acdda6b1a

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