Malicious PDF — malware analysis report

Static analysis result for SHA-256 873dbcf34be4a2f3…

MALICIOUS

PDF

81.0 KB Created: 2021-08-01 01:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b411403e0101582af0519ad341cf53e SHA-1: f5510a91550dff8456d6007623df926eb8995d12 SHA-256: 873dbcf34be4a2f3ab3910f2009234b7d5d400a87b1a3fb4757f7ac10e53a248
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links and the use of 'utm_term' parameters indicate an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=ejercicios+para+identificar+figuras+literarias+pdf PDF link annotation
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6136375d---40342383455.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/57526588830.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/wepixutoketoze.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/a5eb2a0db8073f3ea88e22aef569e4fb/lununavopixufudageborutu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d4554948---domilefegopewijadivuler.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/51709559398.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/talutomujewovezi.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/tonapiwajexelafile.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/d7027693f3815af9e27c8714c3290353/sazifogudufegededulirav.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jp5cjh9pne2qe9l4gblbm7i3n9/26427790093.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/347424df03606dd0c38653bc2d46581b/65605593121.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210724234455712.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b4b262a480852dfc2d3cac02f8f99b62/vekinuroxadujutituravuva.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d618b581d---fezinojetus.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ac68350dd---lijelagotaj.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9375e310c---67535471677.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/77862755378.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/av55qjhrfinvq2l1nldug2trk7/52643091850.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/9646966005.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/besitif.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405ae1543c---numedotebipofatog.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/cc37e5b72dc8b6f6bbbffad274180571/palobuwumon.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/dd509b4f3178332cb8bf95e0f6b302a6/33696253810.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3ab14d5cd---delufe.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_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 11008 bytes
SHA-256: 5417b2b0ec7741bed7d4f74057da36285d0c2134aa61ae014e7f39a95c1e3041
font_02_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 18488 bytes
SHA-256: e3ffffd716808df184b33c26910ee6ccff7dc88f110a34776f688aefd6bd5ff0

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