Malicious PDF — malware analysis report

Static analysis result for SHA-256 718a824d6de80f7c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 09:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3645e35ca536522e68554f0c74771605 SHA-1: b238eadd1e547d9a5f0a38d97c9803cdbd2171f3 SHA-256: 718a824d6de80f7c71c88cfb406c54d3c8474ebb857158b6f609976c5f9d7ef9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alperbehang.nl/userfiles/file/56540920770.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1qneugeo35nepf0f1jak53vl9p/33011153034.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d640b91e99---tavalaxuxiwaminimukopodax.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/vusoxekozukatozimupap.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210910142258.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/loxus.pdfIn PDF document text
    • http://varvshistoriska.com/file/tebogefudevawul.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/91487084897.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/36931218001.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/012247472007.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/wekomejivezod.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/16072199330.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/wizefexej.pdfIn PDF document text
    • http://allycatering.com/userfiles/vitopinarasikodajig.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/rawazaxuvem.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/pisumode.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///54844894209.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/59985183946.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/24772133971.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/5897030849.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/030856e1942576360dce6a37c4bdbdfa/83595045330.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161415af1e2af8---37453045518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=devil+may+cry+phone+gamePDF link annotation
    • 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 17424 bytes
SHA-256: 32b2683e55e547abc2c49d779656e985d165d1a09f1076ed9444289c9817cdaa
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 10736 bytes
SHA-256: c2b9cf4ef21218f334cc98b1417c8a726ef7f4b1fa51168bd16909f200d5f1dd
font_02_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1