Malicious PDF — malware analysis report

Static analysis result for SHA-256 2529b2e8d5a86903…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 17:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97ee73e3b42ccc403864a6ed6de7d636 SHA-1: 8fa591952d0bb536f3c945496df7436438516463 SHA-256: 2529b2e8d5a869034a89b95eb9b4933e5d11e0ffa6bb880d5e72ba6d34aca121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the URLs and the detection names indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=mezeh+menu+pdf PDF link annotation
    • http://www.guus.edu.mn/ckfinder/userfiles/files/19797785336.pdfIn PDF document text
    • http://ruihuitax.com/files/file/69383238941.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/45244823677.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/81089972117.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/wovoli.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/7qvpc5q0fbns2ltljjaau4q4bn/ligoxoru.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc1fb77522---nikexuvufefem.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/82791740825.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/latadotaf.pdfIn PDF document text
    • https://kuepancong.com/contents//files/95661955792.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/remafuludum.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/lumatavev.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515085456932786.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/49622980102.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/rirodoto.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/41009610499.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/95392546998.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-19/20210619181511867475.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/77044eb83869afcbbbc31134cbd1d1f3/sipoxim.pdfIn PDF document text
    • http://cichanski.com/Upload/file/sirebugosawaduvus.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/86589052523.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/zamuzapuginebumodi.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/taxovenavidatipe.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/da42bcb705548adbbae4c94b34670509/32405099192.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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10132 bytes
SHA-256: 805ded399a90e2ac14e1e80a273855fbbb5da3a0eb496b93fe269527ae0f24c9
font_01_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 19152 bytes
SHA-256: ca3a1d5ef1ed553017e81a7969865ccb95f8e1ab46699cb99cd02ab04f88483c
font_02_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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