Malicious PDF — malware analysis report

Static analysis result for SHA-256 5606b7021a35b425…

MALICIOUS

PDF

90.7 KB Created: 2021-07-03 21:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef761acef31040b08ec44f00dac1f506 SHA-1: 1092876703905daef5af8c54284e54bb2d0f6627 SHA-256: 5606b7021a35b4251dd2feae9cc30b6f16361c64a71d07c63ea76b257a182aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware distribution, aligning with a spearphishing attachment attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nomylo.ru/uplcv?utm_term=what+do+you+do+if+you+lost+your+permit PDF link annotation
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c741150c2---35320298695.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ailcbcq9grh864o7ufh353745i/lupodifutejekonunutoduwa.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/22425959387.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/4226998537.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1e0440c32---84760231014.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210622193150914.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/18269492961.pdfIn PDF document text
    • http://lblussana.it/images/file/37436841533.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/xojojisuv.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fn8onr3hk0rpn1jqmjvh1h0cce/70390657722.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/98777840277.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db70cc07d3---pavujuxodepafu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1cadb8d3a6a6c301d3c0ec93c664c7a9/nebolu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ddf65f8ba5bbee38f58a6ea8b0ea8edf/soperibulerefi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e662a4d17b---nukemanuxaloterejagu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a418ef4ac4f---18997538082.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-5/20210605015848567642.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/62591326434.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab04ab1a1---51447682639.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3465dce6---letukevojofatuka.pdfIn PDF document text
    • http://vswet.ru/f/70701558766.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210519105823.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/59267265173.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f44abd2f---34751354579.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/386be5d2edd923ddf6d10f9cb486d463/13378466572.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9145af622a3087c7336606af5a74273f/39822274352.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_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 17088 bytes
SHA-256: 90bfb5e841b7c230a7349e4a4bcd52762174317e8d44f08448fbb1f288cace71
font_02_sfnt_off000142ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AD 10868 bytes
SHA-256: d8e1745a3c94f83fda7d700f70435f1047d9615f7da68c189f7ebe4d2429df0e