Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8835973af0ea4a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acb3ea4d5c5ddacb2012f3724290dd93 SHA-1: 80b3b6ade2b66d16e6e10feb3e04244cebd32f15 SHA-256: 4b8835973af0ea4a368c31dcd2b77950eace61bab35db40ef83a832e9b3b53ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://mastrodibaglio.it/userfiles/files/22996933780.pdf In PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/73661139511.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a03321887cb---ginija.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/lajoreteruz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797fff317c7---refagud.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/44191896460.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/luwametakiduvajuzalikif.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/23e3be2b0b1d78ee6fd5569466822558/95380316455.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b633d0905a---dunutaguxinijoniwip.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880556a1681---58433892736.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/85601882535.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/13880044956.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/bokus.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/38613334917.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/jesamegige.pdfIn PDF document text
    • https://questyme.com/userfiles/file/56269910830.pdfIn PDF document text
    • https://preciseenergygroup.com/media/jugajom.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ehu1vccvqajod0ucqqlki4gvgq/vopivusatokezozid.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/ropagufajetunuv.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/fsbq2c8kobmgk8vp18j6lkd3v3/54789741327.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fe8d68c2---nevav.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/42387532488.pdfIn PDF document text
    • https://network-italia.com/file/13860093695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=universal+package+trackerPDF 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_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 10596 bytes
SHA-256: b501bd36c8f47fcfc74284a4388d3542fbf5fa873a43955472396233f27206bc
font_01_sfnt_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 14700 bytes
SHA-256: 979adff07ba9db5f2a1771190ddd80fcae5f2679e3e0c3eee1965b035ffc9a15
font_02_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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