Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b6249d0e2476eb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 05:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e07fb5151740dc2440920f6de07a573c SHA-1: 4528b3d58cd93b9a127190dcf13621800d9f47de SHA-256: e8b6249d0e2476eb376d6be7817ff47089f00854afe2852a27431938b6992f4f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of numerous links, including those on compromised WordPress uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=stick+war+legacy+king PDF link annotation
    • https://duvarkagidierzincan.com/userfiles/file/56808684770.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/23133735569.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf9b17fc4---jifozosipodovimekisakuzax.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/vufepi.pdfIn PDF document text
    • http://woykoff.hu/upload/file/fijesagadumogonuv.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/jobewimesikiseremiguke.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/xojazutopamozamepotumuja.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/17547781174.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/sumujubevubumejiz.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/sutigevawabekowisukuse.pdfIn PDF document text
    • https://ebooksweb.net/files/file/zulimo.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613369fa70dc3---boxurasovujujunanez.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/vusaf.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/15562333577.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50cc6cb21---welise.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/4744801323.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/25slde5cngrctkgt7cpr2h6914/39742960556.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/81512907862.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/bijar.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/db85b7e1c5d3cdefc5ea6f0c0455192b/kejanafukesomoti.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c52a3dfe3e---12592016269.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ssg5g71173fjubhgm1v6ev68ap/puzonakenosativ.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/wugezexevukesil.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/nademukofufox.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/megetelar.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dab34a0fa---fakifirujavupevijon.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/42966518339.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 10484 bytes
SHA-256: 0213625577ade86a42bc34e77df6e19c549b2757f1ed39d7efde8ee740174815
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 17720 bytes
SHA-256: 34cf9e747a2c2d65bb4ce0925a2260b7174c8cdc6e462a78544fa64a5ad39af2

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