Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b375eb0f08de2c9…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 01:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ab560d5a1270db75508c97f40e089a6 SHA-1: 437bae957c45aa8ada2a397f936b7a7ff5780779 SHA-256: 1b375eb0f08de2c9b16d42285013e651b7a970ada431abc49feb71ec11b4ca3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.como-grup.ro/fisiere/file/48463683467.pdf In PDF document text
    • https://akemi.ro/hirek/file/47482791144.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/3994943631.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/45428251215.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/21912309089.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/daleziwobupagumut.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buzegupetekovebosegoro.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/fotoxakobodefafukimowakol.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vs5d30k6fu31a7c2tuo54ijuvs/47144400272.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e47cdc3dec06e78bffce44370c185206/jitiximotapabezose.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/dumujijizetakawe.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/47410396084.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/birobofozenuzirole.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/fuwinuzerelakewozuvebezi.pdfIn PDF document text
    • https://e-midas.ro/files/file/datotubarikugobegerut.pdfIn PDF document text
    • http://grupophi.es/uploads/files/44029645075.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/zawolumipipizexoge.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/larajowusujiwidogined.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613444a49b478---sajavurogepatatiki.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/94932841180.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/13977105395.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/84293030909.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/keburuforonigomitupejave.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8eaa5cc06---2007769257.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353617108ec---52029048822.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/20916776210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=awaken+the+giant+within+ebookPDF 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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 10372 bytes
SHA-256: 0833363ad0c700cd56df030d21fe31a13ebe7c6e564a6f69640cb49441c39772
font_01_sfnt_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 15656 bytes
SHA-256: c13fea1166c5d34598d182fbddaed9fa08d47e71a878ccb54854b03e74834554
font_02_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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