Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d29c748255bd3ef…

MALICIOUS

PDF

70.9 KB Created: 2021-09-04 14:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43b1d1f5d118abb2c5b0fd1a5f798d5e SHA-1: 61a2035d238fcb0c6e7b273f0f669022ab6e8245 SHA-256: 2d29c748255bd3ef3e335a7e822501545e2948c0d8968f36130fa2055d4d9086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820dfa90539---30625082684.pdf In PDF document text
    • http://kantoromega.pl/userfiles/file/zejorojajamowet.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1f181be3668633e0523c5a473e1785e0/disisuzi.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108131046212654.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/kefemuk.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efea1bc024---mifedigel.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/01659b8bad4325288c6755ce1898d365/pubidorekorupagoraxefur.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/767da8t8c326vntrdvfo3ufo04/magamamudukajofigekovedi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b97c56bd---zotudakabomoko.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b915bbdb769---55440500860.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609634762a0c4---63246650350.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4sqdv6po0cir5qbn34br91o17k/81980580543.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/mozaf.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/53777681533.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/17932504207.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/qg6cvuo23p3arced2vitqo170c/59576826926.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/10378549058.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4444df35bf7d12baadd12864447249de/67733382435.pdfIn PDF document text
    • http://canoeing.by/pics/files/64443706172.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3acce7cf---84863531399.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a0c2d51650351f038f680d8e2539062a/zikesuraboraj.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/22398863799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ibs+foods+to+avoid+list+pdfPDF link annotation
    • 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_off0000b832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB832 15368 bytes
SHA-256: 7156017aa54ea322013010653654e5f836f2bdad71bd29751df06afd05f0a1e1
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 10312 bytes
SHA-256: 6880d2d054a08d2f273d00b6052cc28a5e12f70f2923b79ac6cb9e4511bdb0d3

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