Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff1cb7e493c4512…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 08:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 380dbc03bcd85bdb6dcac5870db93fc6 SHA-1: c81abb24bd3fea0b012617526033c521c6268c33 SHA-256: 6ff1cb7e493c4512790fc3f1dc5aa2a611219a2bc8ab59c9acf54b872a2cfc84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified by ClamAV as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, many of which host further PDF files. These links are likely intended to lure users into downloading malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addaee4345---kuliwifop.pdf In PDF document text
    • http://dobrejaja.com/Upload/file/fovadegi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8kl522cih8i3ils1krkrifsgk4/rogidizoda.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/66486394400.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c79912228c9d82441f94b330d99d8c9b/luxadosazuwelurufavut.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094786053a6c---gidofurifasaxijuwexoge.pdfIn PDF document text
    • https://quangcaobienbang.vn/upload/fck/file/65181829579.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/23601344707.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1ff6bc0c---rudifeno.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/jodale.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/kukoxob.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/renova.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a56c907bd5c82e26a72b6a7977a5bcba/jotakufej.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad7e946d5---46078353254.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/sixafagopevemube.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/vegolifedomenide.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/tafar.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/49954110836.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9a24f583---jemejewasavigiw.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b94d6dd5---tifedidefapipibuxujeboba.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c7f0c6ea04f7cc2e8aa39b830e4ec43b/wililifidanutezamowufip.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/66177506170.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/mefinafoparunorujar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=independent+dependent+variable+worksheet+algebraPDF 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_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 11008 bytes
SHA-256: c83e5e51215358d1cd3a5777cd12170620ed554fc1a006d5143ef72af631fb86
font_02_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 17812 bytes
SHA-256: 2950b3e70d0c82c493cfa4953cd5081522bed0959b9f5c3ab36d744f082141a4

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