Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c48ea741b27745b…

MALICIOUS

PDF

102.4 KB Created: 2021-09-05 15:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 781cd85849a11b81d3a7dc6b69c69f21 SHA-1: 662da5d5c6e1b8a1f48481f82862e4659b0fe1bf SHA-256: 9c48ea741b27745b8a72bb69220213b980025d846f94f3ebfad9d583af2361cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust by masquerading as a useful document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://inwebjor.ru/uplcv?utm_term=list+of+transition+words+in+english+pdf PDF link annotation
    • http://thaihotelsale.com/FileData/ckfinder/files/20210626_60D57BCE015E0E57.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac60b52f57b---89282344466.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502195949781.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab84d2ed6---rexawogukafukebitoto.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/mejopigupexebaloxexazevuv.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/jjn8n1eou0i0u7jgjosqjqoahd/62758052306.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/ruguxuno.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5b494b13d5319b8e98355ac0750d2a9c/vobonabumum.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/ninasafivifamuxemux.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/xufadagugopasuru.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/60538972642.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gukizetano.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/27051181497.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/72038923063.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d0e4c02c---70093518830.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/miretevanibemenebobetamu.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/kexugol.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/051dafec2df69391fe19e92d112e5172/70376706355.pdfIn PDF document text
    • http://indel.sk/userfiles/file/gimigoresowoniwivamare.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/41385784560.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/7865822428.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fcjq34vc5klrqicc3el64tdkai/kunibolikelasipunabesutoz.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/rawoxosanogedolumo.pdfIn PDF document text
    • https://tappowine.com/file/74600137496.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b041c2a923c---mamumozokefatudatidurarej.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/41331338077.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/88566346264.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_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 10820 bytes
SHA-256: 04704d12390c03a739a466985d6978d5a7e5973d6351d4e975341332507e73c4
font_01_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 17704 bytes
SHA-256: a78da4a8152039cfeab55fa73792c181286ceada8e449c36cadcb2022b579329
font_02_sfnt_off00017375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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