Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e570d7af79ebfb…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 10:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 381cd4268a0aa86846f4a0123dff2fa5 SHA-1: c6f4612dd6f56ebd8c6ed60173e5d30c35366242 SHA-256: a1e570d7af79ebfb4c6b6935a615e70646fb67f1525e4963b94728fba47c550e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=hay+day+latest+version
    • http://be-now.pl/userfiles/file/ramutufijikon.pdf
    • http://myagreement.com/UserFiles/file/zudofarinasape.pdf
    • https://bakwanudang.com/contents/files/60630565283.pdf
    • https://sabresources.com/FCKuploads/file/damosalewobipisaresa.pdf
    • https://vntdc.com/upload/fck/file/20290247682.pdf
    • http://bassonconsulting.mc/userfiles/file/zupulekugekilisuvivafigil.pdf
    • https://kingwrapcarspa.com/upload/files/22866787189.pdf
    • http://agataklimowska.pl/userfiles/file/95960528260.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/57115954494.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/3114050884.pdf
    • https://isuzuphonoi.com/data/dulieu/files/simopokowoxe.pdf
    • http://srmtteaparty.com/uploads/files/202109241612205914.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131471fd45d4---zubezakuwavofofuremufaz.pdf
    • http://magooferta.pl/uploads/fck/file/senefawijuke.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b943f15c2---35271415576.pdf
    • http://haai.org/upload/file/78555942433.pdf
    • http://lokalizacja-gps.pl/userfiles/file/51771880934.pdf
    • https://yaslibakicisi.net/userfiles/file/joneposizusa.pdf
    • https://yenhuy.vn/upload/files/jozevujoxekipubedivuta.pdf
    • http://stonebreaker.at/25260782700.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9fa89fb6---zijofuxopepugele.pdf
    • http://maximaviajes.com/FCKfiles/file/fikasekave.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_off0000b370.bin
1f275a41934503dded51e0242dd7d3947e24da754e7f039ccfc51b3620f37e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 10412 bytes
font_01_sfnt_off0000cb18.bin
01eaf815291646857d13707396a9e3d0bb010dedb6e41011c7cf6ad4c3e47d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 16768 bytes
font_02_sfnt_off0000f5b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16792 bytes

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