Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adf515888999d09…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 23:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 339fede9b73858a059f1b8d05308f8ea SHA-1: 1ab5f08fbf6cc88b49a381d1e6e45248c68e101f SHA-256: 9adf515888999d09a6e76c71e6fed4d9e10a0b7de9bf3cb9e625897343e2a734
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gesgo.de/userfiles/file/36178277805.pdf In PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/fizuxubekijoxomixigon.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/85707950995.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/14050504162.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/pokaburedetusivesazi.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/zefixezadewabese.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d53f1db2---88028556088.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090211034048.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/zafivenulevomogeka.pdfIn PDF document text
    • https://0900107678.com/upload/file/litagerajebalakimekomubit.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/sujoripatazusid.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/nesaga.pdfIn PDF document text
    • https://jobtiara.com/files/files/36186322278.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902210401.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/59594510602.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130578c4a90f---xisirizewurifimi.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/kapijebijetit.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/gimuzosimow.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/segemutav.pdfIn PDF document text
    • http://balalajka.nu/media/zademofoxunisapenijolevoj.pdfIn PDF document text
    • http://kite-surf.sk/files/6171724854.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345dcc113db---28161486542.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/fivimizuzaka.pdfIn PDF document text
    • https://digireg.cn/upload/2616075889.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/dusesowebenakovejaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=major+gun+2+apk+modPDF 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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 17884 bytes
SHA-256: 2d2cf787d21474064ad79e18faaa4893fa2f19ce538201dc80b6261ddc6b521f
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 10632 bytes
SHA-256: 169c88aeda7c7690e125adbeb9059d43c2e2e50dca1337960d5cfdcb26c95768
font_02_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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