Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64ef28657354ec8…

MALICIOUS

PDF

97.4 KB Created: 2021-06-30 10:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0f448f96b41badc7fada034a68b9f299 SHA-1: 2fc3b828233e6e3d9ebd994aea9be671be8e35e4 SHA-256: e64ef28657354ec889bae1897a3ba17d03f1c1b2a22daa6a664d6d61d6f2fdf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are often used to host phishing pages or distribute further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=tangled+movie+quotes PDF link annotation
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/i7r060c249v5fa2n6d4003hsk4/97447811970.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c663e5c4fc8---disuwawoxeratetetutosenis.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/7a49641d5286cdd622f9a3f2c2b1cbbc/pulefedijega.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/8d36eeb27949c1312c8a17740d365afb/nixukedejomirobofur.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/baxobudigepa.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/goxarepepuvexuzopeto.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/3745393141.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/50582809492.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b74b8b49b---62843660693.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/wipisutebelixusup.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609d66577935f---telekowipas.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/bc002c6f3f60ae34155777ccf4da454d/wefinulesotapubora.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/tnohjlnf9029bjl8oi486erdm6/52272782043.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b395fd2f3504455aab461ffda186536e/11062950415.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9991d3191---sodutavutokowokasogobix.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608823c8e4c86---91364093653.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/55675062982.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a437c2a09eb96349137b7e93cbd8a887/zadoloxulesotuwugibadop.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/03da2a165f3b3e117cfaa20def7dc4d0/wonobela.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502550a4f0---190341495.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99f62d4e2---xovepemol.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/69dr126p0jj6tev7ctsa7e0v9v/zegobon.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070740623768---wupubodukirefijezazewaxub.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/40103457363.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001416a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1416A 18724 bytes
SHA-256: e2fd7227e12d2d83df116133e5d1b740914b6c493ff96c2c6b0f10bdc336a253
font_00_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 16928 bytes
SHA-256: e3e494a5a5765f7b4866f9357a9f940798c07104fd7af6fcc7c4d75f43a76c5a
font_01_sfnt_off00012928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 10764 bytes
SHA-256: a6efe65bd29358411b5f8a0ec926462a6bdc79504a58e2214098866b09cebb8d
font_03_sfnt_off00015fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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