Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dd38d45a1ac394…

MALICIOUS

PDF

97.5 KB Created: 2021-06-27 05:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4ef367355815a1a8ea9c57fcaa630c30 SHA-1: 05f039cdb5363c1696362303d0402d82b9079434 SHA-256: d1dd38d45a1ac394f9e9f491a472e64a20a3d293ce24f5b28a4d4da1e6657722
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=ability+meaning+in PDF link annotation
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/k8ckdqa7eate17pc680vtejdn6/degajaxebutezibusebag.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/metositukidoxopogig.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/25786942783.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/73887810519.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a587692598d---mubek.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/gubfai5e7nhdlm51i5jlhhvsf0/gaxotuwusufon.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b8245db8e726e0508aef53ced1d498c6/dijulokopesavolonofo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/g7vbsa90v2f8llgge6ivk0qb8g/47372675962.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/60979656185.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f229eb5d10---talapekidiz.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f56f39ab68---37769829580.pdfIn PDF document text
    • http://billsky.ee/files/file/tedasovufizumagub.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/28495338963.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/kusozinesazixegirewiteve.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9116eb53---vitekejunim.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3ef8c4184eecb51dd6fa64e477e4072b/mofazuf.pdfIn PDF document text
    • http://pk.mo/userfiles/file/nuwejepabekisinoxufotetof.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e0ac2707b---19542701297.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762342cc7fb---18701679308.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/3e79c69de50d5bda63222f5eede1eef8/giluledabewuloko.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/dfc582eb69409177416b9f4c73045eec/6528207589.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/36873203785.pdfIn PDF document text
    • http://susutour.com/userfile/file/17348033336.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 10232 bytes
SHA-256: 5126b55fe20268995f0e59adbbc6218ca19d5df70c78ef7bb6f8c66495853e9b
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10296 bytes
SHA-256: e54779dbbc73a7d4c754dc1238dd60f5fb0a75adb8ee09652885f79057b8ad80
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 21084 bytes
SHA-256: a84cee3b737b737491ba0aed1124b0e199558d925c87c80a0f40d86089198461
font_03_sfnt_off00015e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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