Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d781d173c99c4c3…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 01:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89d0774c80a8154879a31e7663e609be SHA-1: 34722f31af0e0cb0a02467fdd8c895d8280f9884 SHA-256: 3d781d173c99c4c3fd5f0de01f614fe75aca2b118bd40de23c844a6d0fd5d719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and compromised CMS upload links indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://garglob.ru/uplcv?utm_term=volume+with+unit+cubes+worksheet PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b605fb1362c---kudegujawabavafatobabova.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091cbfb4dddb---bodegosige.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc876dbac0---59167551354.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6a76c0ca6efb07f6f60f94836e21f348/5413129505.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/xitorolisadovoxol.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161151e1b7a371---57060508361.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vimasegajarenira.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/lotidedewofajoj.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/rizivavurozogolipe.pdfIn PDF document text
    • http://kechengchem.com/upload/files/90557973081.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/aef628bc201275abcbe6ddab13ee6cf6/34796135894.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090c056c18fb---janugowituzigurulegevawib.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/wabuxetonetumewexofatav.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/moxekimadizizo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac69b858fa---8131453271.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/vamewoxotisinatiwi.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/89071943675.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a76bde26f1b---98686403499.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce6b6c83e---15490936241.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/ropek.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/samenebupum.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/26060432290.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/46238205080.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2aa23f82bf5872ded86d6e7911bc2dbd/ditekonugosonokodobozeku.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210522045242_d3blgg.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_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 10720 bytes
SHA-256: 5a88e652648c556a55f8c534870713214cac07e97a43b27db575fb51ad88ab47
font_01_sfnt_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 17348 bytes
SHA-256: 69640e919d74d49b30d3f337ab73aec0f7529e511e1b7c076a382396364e3994

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