Malicious PDF — malware analysis report

Static analysis result for SHA-256 55676357eafabc0c…

MALICIOUS

PDF

86.3 KB Created: 2021-07-25 06:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c8d8766aed18f76b979f0da016452a64 SHA-1: b0313ddb4db1afe2cb6f419f3641311894512c65 SHA-256: 55676357eafabc0cd20581a444789ac20c904caa1a8d2c95482232d164fe5073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a57355a58da0232aec930f46c722e02a/suvokepufikevapedeti.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k2j4kjm37jllrlva9ub3qhc7ao/pekez.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/abd3b7021c147d5f51d123ff627578da/dububevuvar.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/22114643767.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a417d52f---jepiwejidovef.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4f8bcab2---71035116758.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/pebesux.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/kemimamugopamezaresimow.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/22eg4ts2dc25d000lih44f5id8/pawad.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947db306ee2---vinedu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/39449649676.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/41667834766.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/346a490ca53f2c5ad505cdaf49f51b92/63651359060.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/toveradafejel.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/dapobidaluxebog.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/bomuzaxetuximanefiwo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a727aa12b3a1b94e130320a83a6e7c30/livafuba.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc8f44b93---lireluvaxadaxavuwalosizid.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cee94767d56d5459b561dd3f1e3744e7/55612911304.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/wigut.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/80542405406.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/rowuwigada.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g4j9ircut5hpnthb6a3qsi6sd3/kadizakomipebesexigek.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0871cbe473---31403594052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=highland+cathedral+easy+piano+sheet+musicPDF 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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 11168 bytes
SHA-256: b486db1af3c0a4c701db45c681e0a26c1c7e9df9629244c761f6e16263cb8ea4
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 16904 bytes
SHA-256: 24649936bbf2a5cc29b329aa4c72ca0b113a9a8d67d05b7e4784d570df0914fb
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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