Malicious PDF — malware analysis report

Static analysis result for SHA-256 21253081efbe50f2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-14 04:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 807359f67ab264841e8ad99c23312859 SHA-1: adc3ffe6701d93b2db01ecf032ac115c4d319235 SHA-256: 21253081efbe50f25480f8db1c82e727aadc22cbdb9d4a64bd3d4535b133b530
196 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 or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=table+top+racing+apk PDF link annotation
    • https://aashianarealty.com/file/povunifupeginiboxonoru.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/74461245327.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/saperasovovekusanajoji.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/kepogeketot.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/31240150458.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/96981097146.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/kodudajuwimoduf.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/714e909c6f9bf7a2f275d008f841cdc0/gubopubetalebamal.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/11162290006139431a3e00e.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/rukugodivunixefewadeviwu.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/62935049882.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/67646433337.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7g9sv2r5hii7upftbs841pomba/vumomojigagogup.pdfIn PDF document text
    • http://trieuduong.com/images/Download/wegavekakiwa.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9ae0e8cf---39554469713.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fda8a7f2d---59612185805.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/70799670699.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/fexosuta.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/98063382449.pdfIn PDF document text
    • http://salespate.com/userfiles/file/57795741547.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/75144766668.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/temaradubesopexegofi.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_off0000c3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C1 17520 bytes
SHA-256: 697f9145089646e602ddaa034ee0e49325c21ee8263e4a87a8a7db81c7afcfbc
font_01_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 10576 bytes
SHA-256: cbbb0146aeaa03035a11673122beb8106ec8308519fac38c0b2fc958474a8fa9

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