Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d48820050dd600f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 08:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 320022a3ea4907f0481b06f96b98d4e3 SHA-1: eb238aeb8f1ba70b26993e930313d5da08679846 SHA-256: 9d48820050dd600f741e6e25c0810b18bf2d6ecd573238c99ccc5ea1ccbd7bd8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised or disposable domains. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=cool+things+your+android+can+do PDF link annotation
    • http://tovicetour.com/FileData/ckfinder/files/20210911_93E9B5239FBC2BD8.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/50034436672.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/kadumatiremizezixizil.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/wogereseragunezawoji.pdfIn PDF document text
    • http://dalaichau.com/files/kepulapibogagezedag.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/94096314805.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/f70i5indb975foq0fec7a995ng/gabanatoperezezemadukijo.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/14077289732.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/83950955234.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/72490504702.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210904_DA006359F7333497.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/pukugefifiru.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e95e1eeb3dc39bfd0d8b3a4fdc574196/18782647630.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/pepezalilibojaxiwefetu.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/77506954507.pdfIn PDF document text
    • https://agrando.cz/files/file/24052318368.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/39137950196.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/wenibovumavugusi.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/7044113031.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/wonenilalosuxa.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/87488027018.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/37907675227.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/rogenanikefuzabawe.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/46921559482.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161426de4a2d65---xozazutewiruxaravogojalar.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 17324 bytes
SHA-256: 6c7fcb757f792f3a4b0ce45ca638b8585e39bde4d3359a660f369a725702ff70
font_01_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 10760 bytes
SHA-256: fc2de05668155e3c3129e80555929c22229b5f0f7411eca946da651f00133c78
font_02_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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