Malicious PDF — malware analysis report

Static analysis result for SHA-256 45921ddf67c214bb…

MALICIOUS

PDF

81.9 KB Created: 2021-07-04 17:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aca20a45a0cca05a6fe29eb1e528ea38 SHA-1: 583805e386a047d1feb60684f5374d9235c483d5 SHA-256: 45921ddf67c214bb192393bcd083a63042937a2a9822637b197a69ecfe6fc2c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://adepotcustom.com/UploadFiles/file/20210511203106165.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c31b44b42f0315a4090f3f073665c4ee/20665447041.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609363ce8e2dc---savowevogakife.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/uem3visqdpu5muqs9v2f2cr412/35698268792.pdf
    • http://narnivet.com/userfiles/files/povesewexanex.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae277be992---39500707603.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/urdku41craeie7rq133hl6unk6/94768102761.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0f9ef48e---24395029253.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/javurozimejilozo.pdf
    • http://loveperfectionschool.com/upload/file/kovapapawopoxes.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c08852c4c903fa229d8a9bb390a044d1/lubenolomubekonok.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dae0f1fc1ffda71719a3464708c71c56/67333554811.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609777bbacc81---borugenude.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/95549769667.pdf
    • http://cl-pub.com/files/files/23246150924.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/36053648647.pdf
    • https://aymfly.com/aym_image/files/tikipokoperixorajutemare.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ik6qbku0krnqv2epvi0s80kif6/kifuvisewigejopupepum.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5msohibc4cq7ufjuaibb8sg3r0/vudizev.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a7f1a975---16988275961.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160deeda0224e4---95790686092.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ecd6bcb95---76297561207.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/97e78082197c32b7faf26267ed328b3c/56546110950.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a577205515e---fugabagivef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=another+word+for+opinion
    • 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_off0000de2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 16792 bytes
font_01_sfnt_off0000f641.bin
e11edf3a86fb7ef130a0d4b7eb82d0aaa8d082f56e589c11993fbfae4ac78b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 17304 bytes
font_02_sfnt_off00012371.bin
b6ce63e5b42e30aa920d863ba061fcf6795c33f5bb6bd85f68846383c459dae2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 10288 bytes