Malicious PDF — malware analysis report

Static analysis result for SHA-256 251ebd249368e93d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 11:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f601f2992a1b413c69effadaf5575bd SHA-1: 633f472e5d447d950f6209f1935ba74352f99824 SHA-256: 251ebd249368e93d37fb6a51f6e4c15276215a534f14d1cb457092b2d053e672
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://irlanc.ru/uplcv?utm_term=class+cyclostomata+pdf PDF link annotation
    • http://nandishoverseas.com/UserFiles/File/77949610407.pdfIn PDF document text
    • https://topupdana.com/contents//files/gokoxuxokofodabiwag.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/jigadul.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/46179598655.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/96261846448.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vadirapu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/94985049010.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161314771b4cae---83120451844.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ddm6gi6obu2bj7j14o8r4k6ct1/siwigunasatatuvujo.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/80770325006.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/xuzulofasozizo.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/lemidisegazivif.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/94488802676.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/rifurakusuzowusidogoxapem.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/12355634113.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/sezapoguramimapivureliboj.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd9c355bd---kagexowipafe.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/biboboledemijiki.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608684ce223f4---boporedamoduzo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1561f62e05---kidopawaxotisenejelogaf.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/papoxobig.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/928485791.pdfIn PDF document text
    • http://asfalon.com/__files/file/xetubarewojulu.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/11420373041.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/mubikikolodonelugovizivif.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/69231822005.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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 10500 bytes
SHA-256: 32e23cdccd7928dc3f5dee83572c0de06abf4d9de55f4481ac1e1e5f8d0edc82
font_02_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 18980 bytes
SHA-256: 0302dbbe1fbd170c570423c7f4f1185303c051b3d32b6e991148cb1dcfeb26d1

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