Malicious PDF — malware analysis report

Static analysis result for SHA-256 1925d9536eb84a98…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 05:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d187916c5389458fd9e26df5c0af3fb SHA-1: 04b2244011c640e36e7d61f4f87b11ea26ecde09 SHA-256: 1925d9536eb84a9887f5481941083fb1c1276a109369a8130dfc9357e8e3a265
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF's structure strongly indicate a phishing or malware distribution attempt.

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 http://zwickerfoto.hu/_user/file/71431552216.pdf In PDF document text
    • http://chinalabware.net/d/files/feturonezapugizerojunovi.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/seridobevodefipo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/kufodolipibupixijinobimuv.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe3b1bbbe---79425554386.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136999ccba26---84607527246.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/292964972.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/papujamugovoleku.pdfIn PDF document text
    • http://hmed.vn/upload/files/jukonemolosow.pdfIn PDF document text
    • https://comfort8889.com/upload/files/xubujonofurorikaf.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/27489326634.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/vuvopetemawunevibalamavi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fekineniluzulifasates.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/26540155404.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/papabovonikoxivog.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/2668528212.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lutolufa.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/gakedomituv.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/18687711715.pdfIn PDF document text
    • https://subded.org/userfiles/file/52041342951.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903133826.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4db5f33a---xuvokexukodumawebivo.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109111950224394.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/98805986603.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e401b56e28---naxesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+stop+motion+proPDF link annotation
    • 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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 18616 bytes
SHA-256: 83639eec72de346114f05e9d8f4e8ed0a9f78c348f40affcd4eb162f0f6d11c6
font_01_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 10508 bytes
SHA-256: dd0a184fdb49c5b451d8864975662c639b979194f5aeabcb4062629f45a91fd1

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