Malicious PDF — malware analysis report

Static analysis result for SHA-256 306799c7077f49a1…

MALICIOUS

PDF

76.3 KB Created: 2021-07-02 18:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b8b48760591d30dce9d23967cbe63425 SHA-1: 7182672c8902afe5a953163e25fa2d64850257a8 SHA-256: 306799c7077f49a1368a5bb680af4c7a46c051adbb5223090654587a27fc5b64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content on these external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=the+crucible+multiple+choice+test+pdf PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737079da9c5---vixixopixarokapebaxonif.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/30846585848.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5b9f1a5bf5b9017baf0bac6d7eb94a94/25441986020.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/miravi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8fpdaad3bfi607s4v817o8ghf3/xopapizakividij.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210701_110114_7548.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/jotakajomivo.pdfIn PDF document text
    • https://efnnma.org/files/file/tibifisiwaj.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/53104338175.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8f94fa4f---41225787916.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9p80tfnut6bsnfn8grk4o2b07o/detiguwuvilijopomatonem.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/55178180159.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0966472ce2---9386146689.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kc9p1da59or8n5lgml9tkhbumm/zagul.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bcf4j8qq1vko34h4pdmrne83jc/88509974235.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/dilujozepafij.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/nogutikolirarawagodebesup.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/37057828583.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48919ff86---wojelosaniwuwusu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8980f76ae7a35bf5efa4843f3bf6139f/norelaxixonam.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f85242d8---ritovab.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/mujolosum.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/077fbd60a54f3b43efd21b2bd716fd28/26421653878.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/zijigorulupazadegevilixid.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/667d1ca6ec0704bc2989125c2ecee149/dirorotasi.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/25139953940.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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 10824 bytes
SHA-256: 2ba1d5757d448cec11fc76994fc079c30a25af270a347f22f04c69c3400fb005
font_01_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 15800 bytes
SHA-256: 793fd147cb5a954ff2b992a24c019683598d686e6330e42a144b9c7414f6150b
font_02_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1