Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd8c694aa99e62c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 03:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60188e9ee4578a41cc23d43b633ab4dc SHA-1: ab2f997df6b69e50a8f1206a4b7c53fcd6ca2b3b SHA-256: 6fd8c694aa99e62c9365185f6ba0485e8210d90c1d1f500bf8005093d8114248
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions and a password to decrypt a malicious archive, a common tactic to evade initial security scans. No scripts were extracted, but the overall structure and heuristics point to a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=wps+wpa+tester+premium+free+download PDF link annotation
    • http://profesniprukaz.cz/ckfinder/userfiles/files/8465378953.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/nifav.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/64e63e12a54d10901c12fcdd990c58d1/katotaxom.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161485b0ce4eed---womisunekupezodibobut.pdfIn PDF document text
    • https://e-midas.ro/files/file/tosiwu.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/63255197647.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109230113102305.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/86892722528.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jijelur.pdfIn PDF document text
    • http://hzqzg.com/d/files/48626597320.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/19561516816.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/vomevivazipadixaroliz.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/risikuwakaviw.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/de7f95eefcf0c24dc14dcb7b8e66fa9d/begekazaxusarajubem.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/54714515788.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/xalerinufegi.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/kaxomarujab.pdfIn PDF document text
    • http://honda-vo.com/upload/file/momebiwaju.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27567207861.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/kuvapejilar.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614d24a3875f7---71038063925.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210916064839.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/67277486115.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/gorowije.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/14386892139.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/83268834752.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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 10840 bytes
SHA-256: 49403b50150aa04563f5377dff65d2a6d4076b3dd0773ccc252720ef7003127a
font_01_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 14544 bytes
SHA-256: 9718f4da3f52f4280b1978cf263b964b382e9d97cd4343a5d849964664b2dd7f
font_02_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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