Malicious PDF — malware analysis report

Static analysis result for SHA-256 5099a0be96c2cb09…

MALICIOUS

PDF

82.2 KB Created: 2021-07-07 04:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 748f9dba5ca07ea74c668e47cea2c0d0 SHA-1: 1ff85deab96e164d8afd3d9e09d4652c936e1b23 SHA-256: 5099a0be96c2cb0901fe9cee20c76c7548a1ce608f459776a7ecad035a6d54da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary goal appears to be phishing or distributing further malware through these compromised URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=s+130+test+answers PDF link annotation
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e296cf71eda4a75ca07d8f0d320d2e42/renonujamofepofemeva.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b864fb07ad4---wuvelevulasotavexepabogup.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160757cb2d8171---3547739475.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03caf1d352---66923564416.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/33377328624.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/jezisijuxotakumiwoj.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/2067937947608d3ba9c0e06.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051510115677.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/funosabelu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60aa8095cc---90831386377.pdfIn PDF document text
    • http://geose.ru/userfiles/file/zivotomevivona.pdfIn PDF document text
    • https://pindimana.in/uploads/file/boxujozotubaxowegisexe.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/wizewawuwusukalomom.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/vgut9acmop5rageqlj5egnc7r1/58152450183.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/feguvewew.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/11169452146.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/xilizezivewovifefojara.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/073938b5f2c48576c94aa8389c600d30/67037395723.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/40649774231.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/zerakiwiva.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448c050e0e---jagavusorozusowubufuxo.pdfIn PDF document text
    • http://cy2hand.com/userfiles/novuxexobuxafu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d9f2bf560---jejomeditimivax.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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 10348 bytes
SHA-256: 6b06f45a789d17c9629eec456d7046de483b2e4b60fbafd5eb9bd201585f0f5c
font_01_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 17424 bytes
SHA-256: 36a0066a41e2a437907328fd3193ebef0e7602c7e9ff0b74d871dc9634efc855
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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