Malicious PDF — malware analysis report

Static analysis result for SHA-256 f504c2577d5163ff…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 05:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48e456c4517adfae291d0b6f958f55d9 SHA-1: 3f37f9a04ac72cb8a3de6cbabbc9aa1572a02ee2 SHA-256: f504c2577d5163ff391cee1447b3e7718f4562b5d2ac7efb708cd98cbce0a812
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=caterpillar+pattern+worksheet PDF link annotation
    • http://aldara-latinoamerica.com/userfiles/file/27775224647.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802e43ea26f---94827543423.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/92ji5l5ppi41ne48akga86fbv2/bedeme.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/907955be9f24011770584252503343c7/79915032636.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kavasamupataravofapavupap.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/22247300600.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b608d235bcc---59041165613.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c964f152af4---fomomefufefak.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/xobepozibafubavu.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/23608755936.pdfIn PDF document text
    • https://aedwea.com/upload/foto/xoseparepowapozabag.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/42827184908.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/girovitoneneluzumiveruzi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/56617731525.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/af81ca2a296cca88c41e81cd93842ef1/15867273148.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060317505540.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/t72kh5imet9pvl088a8mlkugmg/xejoxaduralunaxajivifuz.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5b94c87e4---65827635557.pdfIn PDF document text
    • http://sooclose.eu/upload/File/gubavoxijovas.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf64114f5---70401382002.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/70158142079.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/15517336022.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b963501b652---84908606524.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_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 10560 bytes
SHA-256: 37a4c7c2f653f390b290cb9dbf51e247d280325f4afe0f5b6994ae6b8453c9db
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 17320 bytes
SHA-256: 160e708c2995f68a50a16afcc2749331f58a7c1fd5d5fd961f17a97c853d83c5

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