Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b21995978c8a744…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 13:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 34809ec22a582438a634972e9d9a304c SHA-1: c383f7b1867e509ea528326a52ad6c05db50d4fd SHA-256: 4b21995978c8a74461a976314101d977c859a6f7201159ccd66d2ba8d68af1a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=animated+bus+pictures PDF link annotation
    • http://rioairporttransfer.com/ckfinder/userfiles/files/sokowepixasu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0262dcc19---paxevawekotuwazas.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/varemoxikesozepafozufe.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202108061618069611.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e766d03e9a6295082a055827f34a8d4d/texozenujibotusuza.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/50829204875.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/siviwol.pdfIn PDF document text
    • https://dineflon.com//files/kojuritavizewadetogodaxis.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f71a689627---81490115990.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07fa735f41---36262657940.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/sepolilufanaxep.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/14572623912.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/25138340338.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/27308490208.pdfIn PDF document text
    • https://palet-school.com/files/files/64168362157.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/konubazufaduralaxoba.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/bojufuj.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aae5e76f3.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/95738410344.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1628068515554894325.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/3678665940.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8936bf4b1---37451697437.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/vigetosakuguzuridebomuxep.pdfIn PDF document text
    • 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_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 18464 bytes
SHA-256: 723691b31215c50dd3151c4ed32d39b86bd7b9b3c2a2bb3adc1d03d56edd2f23
font_01_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 10732 bytes
SHA-256: d5a7afc3b7800fa5291d19315ae9942d4091bcd81dd1ccb6713fda066c3cdae9
font_02_sfnt_off00013a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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