Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5b7bf24cca4e64…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6db2ea17dfe0977e89039b22d49ff0c4 SHA-1: b61c8114155bc3ab4975bf39e89e390021caf539 SHA-256: 4c5b7bf24cca4e64bb615ee507f3ed3dc77f9c7cee02c7102ff9b2f80db858b0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=antutu+benchmark+android+app+download PDF link annotation
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ee585d51fd2b61e4bf0618e770759c6/nuwob.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/90043052327.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/rolanabudemitebenupek.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/33814907977.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/85715506191.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/duwetiguv.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/karum.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/41513582944.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/pujevidotubesarawid.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/dakolebiwaleseta.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/46822184382.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210915220059082.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/42310974614.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/bonapidu.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/27713011441.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/lurupis.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557b4d5b587---70233830770.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/buwexo.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/55138511737.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e28504a36d---zobuluvibupufetawufomipox.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/47206540562.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/zuwusikusabinijezeruf.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/32605676501.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/moxifafedugajewa.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_off0000b303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 15932 bytes
SHA-256: e47b84507a5c91755b143f1de3cfca77a17feaf216278db47072088b23e3734a
font_01_sfnt_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 11012 bytes
SHA-256: 1a7b0754b0cf2ab9da49a694ab8cbd6a4a4158b16b3d5904290d7053cfb48965

Open this report in the interactive analyzer, or submit your own file for analysis.