Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea3ca821ce02f15…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 00:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a9cad420710dd53006ce25c919e59ad SHA-1: 79cbf5764249e89936a0b0e7661ec3e2cb0a74a5 SHA-256: 0ea3ca821ce02f15972973dcae22ef20f0df51f9b510e37769e073f58d954ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics reveal that the PDF contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to disguise malicious redirects. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly indicate it's designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d13b55c726d407814abdfbf7ea3635f8/83537792548.pdf In PDF document text
    • https://gangnampools.com/contents/files/vamelekibexi.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b06ihpu94954db8aoius7n182k/bavikufozironuvizub.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6d1f5ea5a---sizavefakusi.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/wujiwofuvaminatelupopilor.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/27aac120c8f351e90c1e58ec64c77505/lanotepukupejifoxeva.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b69f9e412e---74166805350.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/d26e8ffca11b29db0027e26547e54030/sivofajo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160768478c45e9---liroxawamezuse.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/pofugedefunazoval.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1d78rbett69l0keg3e0qfgjh2/guzozubeko.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/88379283269.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/nuwasufumag.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13263c1636---80506124340.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/10315859226.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0dcab700b---nerinazo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fd0a2506---51646362112.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/pobezanojalefakidi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160812c8669f06---94263074387.pdfIn PDF document text
    • https://cooperspick.com/files/vofawinonalewatitotar.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/66914563946.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/zarosafubasoxoserunene.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dbt9u6gqecirh877i1vmr7da24/88327691860.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1265da9a5b2b92c5b0a623ba3652347b/41279843898.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/44502814606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=modelo+neoliberal+mexicano+pdfPDF 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_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 10748 bytes
SHA-256: ea8682d4e1a32747690b26d74af93b38484bc2d79fd9f4ce1795b122f4a207f9
font_01_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 19168 bytes
SHA-256: 4241167a023d40e2abc3ec0a0098da07ec9cfb3c292ee7da2413ccd4fcccc287
font_02_sfnt_off00014339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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