Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4c1fca8cc0c96a…

MALICIOUS

PDF

93.1 KB Created: 2021-06-28 21:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c26d7afc6997d0eba076273491536dfe SHA-1: a96e5cca72e43d211b57f392e8b37a86f2347c0e SHA-256: fc4c1fca8cc0c96abc7165ee9749c5796a01138db652391387079fc3efe9e3ed
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, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. This suggests the PDF is likely used for phishing or to redirect users to sites hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=words+starting+with+m+and+ending+with+e PDF link annotation
    • http://stardentalcare.org/userfiles/file/gasuz.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3df57055---11589770998.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/91791810136.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/4999680443.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608101009177a---juruzotenafodalo.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jrpfjlcp491po5plu4mci3oo8o/82702466689.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d763cf36ca---kewamosupogomokilujur.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d84ee93872e9ddf316695a838cf65f2f/ketewazela.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/e2j6iv2v0iiofjqdonmtgdvelf/gizowegalefexelotulewufo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ce76fed1---92813919279.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160755db38c242---64240726109.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/45464995802.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gijebomogetudow.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3d2ecaa8---78605057448.pdfIn PDF document text
    • https://clove7.com/userfiles/file/noxisige.pdfIn PDF document text
    • http://szpk.hu/_user/file/92562005047.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaecd3158c---97428678219.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf566e240b---dutaman.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d075552788---68845650359.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/sudozalewexopef.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be32f1ec1---8171071476.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
font_00_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 17372 bytes
SHA-256: a953dca3ffbf45e2d0c7f515d24b51cfd64dbc9c062be80f838a4bc8c0ff1eac
font_01_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00014e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E34 10728 bytes
SHA-256: c670d1cfd69dbef48628248ab312abab59372200fcb02f43d8b30231c2072ce7

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