Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29e9a5361e2f016…

MALICIOUS

PDF

97.7 KB Created: 2021-08-25 17:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1989dec05a0549d30d786daac48fa3a9 SHA-1: 1ff7a30b065f1430d1a910c85b8767eaffa862ff SHA-256: a29e9a5361e2f016eaf57ae8b5d678f0d6c38ece94097514282735bcce0a855e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URIs point to compromised WordPress installations and potentially disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links strongly implies a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075803cb8785---silavenafunaberida.pdf In PDF document text
    • http://donauwell.at/userfiles/file/49337861345.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/53715525680.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/21658743426.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/rovowuvitapegazili.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/kedapox.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/71146769367.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/28862898820.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/cdbjnsbnu6sve111fb81dpk8v2/mozirexosim.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jelexogovofetosomufaf.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/150825855560cdcad3846ce.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/fc031b41d0723a5511f960831e91db73/xesevajuserurej.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/79642066636.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/26718432465.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/78030812136.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160845573c40e1---porowixotomovetasodidixoj.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b51652e2f8a---91016390835.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2677a7227a---30791278669.pdfPDF link annotation
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/74579539461.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vgut4ma0v3fgj7e5fipciasc68/fulusu.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/matopisaboxedusidonasuve.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061901104769.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210821_000752_143.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16088b29eb1f33---81296406750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sacking+of+constantinople+1204PDF 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_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 11096 bytes
SHA-256: fd2fffafc2d757bd03ba404b317dae9af6e67ef28c3e93513b67fc4a001671ee
font_02_sfnt_off00014a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7C 17392 bytes
SHA-256: 6476a0d98ea93333477e5faea83805ff9ab404a0de31968890d7bf4de198deca