Malicious PDF — malware analysis report

Static analysis result for SHA-256 5429a16d929abac5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 14:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 054e519cd8817bb0066725cd11e86be5 SHA-1: e47bf8b4436a73cb76d2d62aff06dffa91696358 SHA-256: 5429a16d929abac5eb0e98ebe498eab138d048ce4d49a9fbed74f27c34f530f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://karimeh.com/public/userfiles/file/laxuwubokirepimanevo.pdf
    • http://gzhangqin.com/uploadfile/files/14614615156.pdf
    • http://hrzservices.com/uploadfiles/file/pivajixodejow.pdf
    • https://vibangthuaphatlai.net/uploads/files/6953224483.pdf
    • http://salukool.ee/upload/userfiles/file/fudotivinotubu.pdf
    • http://grupopiscis.com/upload/files/xagarapexukowitolilesi.pdf
    • http://infinity-pro.ru/userfiles/file/47066170331.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/54t1kl43qaqt9ipmf4076ln51v/pukoreboxakabimugus.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a43cbf679---xowidiguniretakukix.pdf
    • http://popmetre.com/news/files/ruxokowiwi.pdf
    • http://royalwedding.jp/images/blog//file/jetitosabizuxatowivepiver.pdf
    • http://sushiyaslo.com/uploads/files/83538849744.pdf
    • http://veterina-hrib.cz/user-uploads/files/petupenavigipuwowevinip.pdf
    • http://beulahcooleycollection.com/clients/870349/File/99743888095.pdf
    • https://kham.vn/userfiles/file/woromunasezepedu.pdf
    • https://ihappywash.com/uploads//files/202108111916343237.pdf
    • https://drticket.ir/basefile/drtiketcom/files/24091759152.pdf
    • http://yaqeen-eg.com/userfiles/file/faronunusewe.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/eci305a69idg6icosgbpv74o45/37606145596.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/gkmqdbe3rv3ib5r1rok1fn4q0t/jajokuzudunajetodotiwuver.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fc5afdf2e3619a6ce22ae4c7fe2b69ed/94808290272.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/18446295727.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/65045993831.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/42547477432.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=warriner%27s+handbook+first+course+answer+key+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d720.bin
d90d2cffdd953bf6502f24a4ac3de8d85b7186eb165e617ddb89a081c9f2d8c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 11232 bytes
font_01_sfnt_off0000f147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
font_02_sfnt_off00010959.bin
aef777dc6f113f8b9542be47bc1b9dd723a1c2203836746332fc056cebe79f93
pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 17452 bytes