Malicious PDF — malware analysis report

Static analysis result for SHA-256 847b00e1d7afd77a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 04:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1cadef4fa30990a15e97251ddcead22 SHA-1: 66de31d321b2d292b38bcbb6168c2e848ca346df SHA-256: 847b00e1d7afd77a5d6705722d3d7bc660d5f6fd2055c9a8aae388fd7d6b300b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pistant.ru/uplcv?utm_term=four+letter+word+starts+with+w PDF link annotation
    • http://networkinglikepro.com/ckfinder/userfiles/files/62532176888.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/wewutalanamomar.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15c07129e---fakizo.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/32030134091.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925310e40f---moliduwovijunuva.pdfIn PDF document text
    • http://saaretravel.ee/images/file/17569217885.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/buxopoxolaruxemesamagijij.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/97728064532.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/98995292730.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pagef.pdfIn PDF document text
    • https://nls.vn/upload/files/40540494743.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/vufijevisud.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/mulobopeg.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/lolatunibirozirojenon.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/4947005047.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/sopevorefivomu.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/fewaf.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/muwujagitipekemesanatij.pdfIn PDF document text
    • http://z500.si/files/11059637553.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202196154322.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/2461308221.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161336a90169bd---4269770581.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/gakazesekezabawiwibozak.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/biwom.pdfIn PDF document text
    • http://travellerisland.com/files/50704599905.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_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 17280 bytes
SHA-256: 26534bc56b330078be3cfe4d734f9eb8f4a8e00dfdaf03147f30a5e8e5a7ee5b
font_01_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 10404 bytes
SHA-256: 52b84e3cb7e646fff5c4c809d8d020678f368168a4534216243b47a4a03bc7fd
font_02_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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