Malicious PDF — malware analysis report

Static analysis result for SHA-256 3131dd655de1a458…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 03:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7c28315ece902c7ab919fe350688502 SHA-1: 9a44d3aa57ac24ddbab343d2adf8b2c21c644474 SHA-256: 3131dd655de1a458f603852e397e57f913d145d5ce6ba70103d6032c8a7e794e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=how+to+get+wifi+password+from+android+mobile+without+root PDF link annotation
    • https://textosolutionslinguistiques.ca/upload/editor/file/82057418954.pdfIn PDF document text
    • https://network-italia.it/file/guxojali.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4ede0983b---taduzigelovobu.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/zepomezalebe.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/12190729884.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/jukizixupalunotip.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/velisowutaxenapo.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/livufirimemulepu.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/nufegijav.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/fisinixumenop.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/50931887151.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/joga9p8g4bjk4qmbfclh3p0jtu/xiripapekixuledameja.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/59992130086.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/bibexodemiviterivege.pdfIn PDF document text
    • http://zaiger.ru/img/file/80438608889.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/fodafewezuseminupoviwi.pdfIn PDF document text
    • https://titishop.co/upload/files/85738807626.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329064a6f08---kedofofujogumenoletelovi.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/24308321897.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/17083950785.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/10061830320.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/71399331489.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/95761094057.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 11260 bytes
SHA-256: 3913ed0cf5fc8cca13eecd850914e1343957cfcd15ac3fe86074150f9cfd771a
font_02_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 18108 bytes
SHA-256: 76cbb920f67b30e96043ff9a836c71c69b4f236df47c7415f3752a0b917c5512

Open this report in the interactive analyzer, or submit your own file for analysis.