Malicious PDF — malware analysis report

Static analysis result for SHA-256 2510ea36e99953b7…

MALICIOUS

PDF

88.9 KB Created: 2021-09-12 10:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99c962e5e874b2fdc28d0ed75defc4bb SHA-1: 1349f373ec74ef12032c263412e22d5f3bca2edc SHA-256: 2510ea36e99953b7dfe2beacdba60cf4908555d29717d2073e35aa88d701b0b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised websites, suggesting an intent to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=cara+menghapus+sampah+di+android+tanpa+aplikasi PDF link annotation
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/sd107ne28fpus77ivlte1irrft/4957007399.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133d138c82b7---rirazika.pdfIn PDF document text
    • http://freewest.at/sirajexonejunirej.pdfIn PDF document text
    • https://huanghecables.com/d/files/38396701617.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/sefujazilawoxa.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/49982566198.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/15419680605.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/33962642227.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/lurubiwud.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a405640b8ae4b4a069ad61a7b336ba58/44766457306.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/zajobavatidule.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c24df2b9f---dujilika.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/dikixer.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/73160810468.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314f59f349b---rawadivizos.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613da07dd9e42---zajevekab.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/napanalux.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/funapobazikerivufadof.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/gewepavoxojidaz.pdfIn PDF document text
    • https://superchills.com/userfiles/file/tujodod.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/pulevokuvosuruzikovekopak.pdfIn PDF document text
    • http://th-hl.com///upload/files/60121403693.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/milofilosaxosagupize.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 16804 bytes
SHA-256: 70865e4967d1fa2ddf2a2f73132831008c755d7d4053fba80e2f5fe25693a039
font_03_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 11060 bytes
SHA-256: d2f46d2f9e13c003e96dd274ad83cdecc88d881da118ededd86c5369be67742c

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