Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52b0455bbf4e2a2…

MALICIOUS

PDF

93.0 KB Created: 2021-07-02 04:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cda3968eca13b0358a76ed67541beba6 SHA-1: 1dec2cbc2cc293ab2b3a939536226cc5908e9410 SHA-256: c52b0455bbf4e2a278e5fae336418181167a1dce21b03ede25cc5f4653ef0b6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the heuristics indicate a focus on external URI redirection and link farming.

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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2f61fce7---99084890656.pdf In PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/40723878403.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa203748057---sakibijopofigi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovs7b0bvktc1uj5ok9ne6gd7p0/51783583668.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/68f82b203fa17530eeea9f89f09401b6/65301052078.pdfIn PDF document text
    • https://buka.ru/sadm_files/67345119262.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e6388bbb39e914eb9fc28f02da84ecdb/51989577915.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/kuligoxanugubipoxolike.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/wuwexusedufiwovebelab.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/sowofi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f595356670d3349c9d463b1728ea38c6/99730047409.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2f3c85c024301977ea75f38e073eacf2/nevudurizobidobe.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad70db300b7---vodeteluru.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/og4n1bniak5u1qid92drv09ri0/robixunaguzolakujobamoke.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b501e836276095111da9933308f584e6/zaberigul.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8vfd7hgojufcfv2mmocml027pe/61171563236.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/79554196155.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/53bf00892973ede2f03d311f86805e01/gozanetu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/71236693287.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d234ab27e8b2a79c5eb8681125667e90/7525193437.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/c228b6f7dd2f365b024793889ad917b3/zomubudiseboba.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/juzuliniw.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a82c4506d2c7b35713d8ec56860ac052/27296458907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=severe+sickle+cell+diseasePDF 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_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 10272 bytes
SHA-256: 1758517e33e190d615e6373fc4a053395305818e8d274829984ad1c7d49f1ad1
font_02_sfnt_off000139b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B5 17852 bytes
SHA-256: 7ec90932fee4b3f4dafa6d23a18d7ae1b99b9b85ea6d34c7d4cd5e47016b4528

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