Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba3e622f3d19b7c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 14:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1302730f1d2d28829e57af51da340625 SHA-1: 5248b31ad8788a610ceb2676d54e505a36a26ef0 SHA-256: 1ba3e622f3d19b7c81b5fa173b3f180489582f4bbc677e458db656d053d20d0a
156 Risk Score

Malware Insights

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

The PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while numerous, do not appear to contain exploitable content directly within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://icnj.net/ckeditor/ckfinder/userfiles/files/77156509589.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a9f4b2b1---39545866658.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/pegasawumunowiw.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xipefasisus.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/kuzoj.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613d353a899c3---wenebebafoxewasalimo.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/xugob.pdfIn PDF document text
    • http://staropolski.net/Upload/file/nexotaj.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/29556964602.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/7553233477.pdfIn PDF document text
    • http://dmkert.hu/files/file/44101603034.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/25333545181.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/29305045349.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/sakujakanuwoku.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/9dfaf464e281c1e301b440c103e6485e/65337982028.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/82806956204.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/80144396005.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3aed5079d---73268008634.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/lelowuvu.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/41973915125.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210909003725.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681c193a73---2669345793.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/munerugazanipifima.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/11078464903.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bojobewavizaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+human+wellbeing+geographyPDF 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_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 17056 bytes
SHA-256: 74abebd7ff8f0a47e8a7ff8c8e2e867d6d7b6fec9e0c68d1ad7ee12756898f1f
font_02_sfnt_off00013b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B70 11132 bytes
SHA-256: 66c24e3629b777c92c59d00eb77ab24491f46d046b2d51a1a9b3c5ca8ed76a77