Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa6796b0853abc4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 02:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99ca9b8f805f7da71feb0bef510409e4 SHA-1: ff877158eac03d75cc8334fe3cc0cab0d768bff6 SHA-256: caa6796b0853abc42ed0ae44bee928b56bf8c8b6668c9799664d5f5071ebba63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=ver+archivos+cbr+en+android PDF link annotation
    • http://adamlegal.com/userfiles/file/gosejidulewiginiwegojar.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/rolunovumo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/sawutewi.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/86445821137.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/junejaxetatelosifexamow.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/jusajifedikuxuzuzetupa.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/890293380.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/47576310799.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e54a960821ef526f68ca95d9153bf76d/49258374572.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061635573617.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/91057361435.pdfIn PDF document text
    • http://mq-water.net/upload/mulizuzogotabimap.pdfIn PDF document text
    • http://furniture83.com/upload/files/29193051131.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3975a706f---gunefexuwagalokoz.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/gajowaxuwulibugazijewan.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/namawugadanalilaxo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f8fb2d23d---getan.pdfIn PDF document text
    • https://masihpt1.com/contents/files/pedawafesorukifoxutigu.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/pozawagut.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/79406819518.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/lejowipibu.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/50808997093.pdfIn PDF document text
    • https://citytrafik.nu/images/file/39124434968.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/56316032117.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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 10496 bytes
SHA-256: 82332b985036c34dbb517499392d08e40789499317724254eacce8a8029f4ea6
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 18152 bytes
SHA-256: adb6c9cd88aa3871ede1b58e11c6f857cc29ed49475779117fcd042b2d2128f6

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