Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97d7523bc4dff5d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 17:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dde0cae7a7e7886d749f41ecca843397 SHA-1: 4c17cd39966b5d8a6b20223284941dc1ec592896 SHA-256: c97d7523bc4dff5d0dafbc1d9664ca812ef8def166d3feddecdaa7918d5fd336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=brain+wash+amazing+jigsaw+thinking+game+apk PDF link annotation
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/45131350722.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/13592075218.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af4ac47fd---68793457845.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/73918537697.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/romusexifixatogekodewo.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/gijamisixatupidazowerewa.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/zujuruvizawuvoxanakiwok.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/lifofizokawe.pdfIn PDF document text
    • http://texmet.pl/userimages/file/mibarulubulul.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/botubosobin.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613608ff20e43---73043600408.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/67213126224.pdfIn PDF document text
    • https://kaisar168.com/contents/files/lovefinegabatinojera.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/73048846217.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/satabimokisowekux.pdfIn PDF document text
    • http://metall-press.ru/files/87842780818.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_FA928360AE5C4F9D.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/zisugo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161393f4e245d6---29848457569.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/2577496433.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/37552131467.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_off0000b156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 16052 bytes
SHA-256: 0d76f5a16ef0d37c6921108a5ff26a2ad3a1f16329b0031a84a737ed566b614e
font_02_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 10956 bytes
SHA-256: 1062cc96edd6069cd5b13cf0af1d6eb7f23d7f74fd16b5212da17a5738381c6a