Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b31052494063d05…

MALICIOUS

PDF

89.1 KB Created: 2021-07-10 05:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70b6467616da94a69b5ec4df5e0a85fb SHA-1: 6c8dde7a83b3150b0b3a53f2dd64956c1b9fc124 SHA-256: 8b31052494063d0596248035228ae1c0b7d8e8941c8c9997fff11ce66d656520
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host further PDF files. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=how+to+find+frequency+of+wave PDF link annotation
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea1662e5e---24905555361.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4e7ef934112f96b701397252ef7f6157/81613486623.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b7b8e4d7---61874655648.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/zekepo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/i7e0sa5kcl50rb9s9rm4nuqfl8/72239163263.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4166792799b101ee30a8666d28a4f247/doxexilunewalopi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/shucm9ck3m9g6jbkd6ji6np3j1/zarejavofozutajebinef.pdfIn PDF document text
    • http://teifsepahan.com/files/file/90017392542.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/bepagukakibili.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1inclhtck6abv55l4pc9ne2e5c/lidofuxisu.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/vdafm677efbl5krgr82b0akl1a/dixotanogojepumizebep.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608af0b077e5a---53856403148.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/sivonenevopesavataki.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bv8qbfosdkob5dedvedkramgm0/juvufididosivelosi.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/47837025952.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/fugebupiran.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a8474e0e40d736926eca095090809e76/87764313422.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107090554074068.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210629204544.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/waxebogurepetupigawaxizin.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/3c578bbdd6444620276530a45a43ce56/manabakasixonow.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/948d85194f30ffb4125b4630d1ddc2e2/suxusalenekapisuwuje.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/60103544481.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/47f0e70bccf04041dd0d7b123d3f976c/gidoxixurepava.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/movigovezixusoweri.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/gajij.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_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16440 bytes
SHA-256: 496289dccb79aff26fb65e35398ddd6e6524c367043b1b61a8d514e385fba7aa
font_02_sfnt_off00013e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 10760 bytes
SHA-256: d92a8dda05e80297b6931521c687a3f4116b9d47919fb2c74794a22c9aba8055