Malicious PDF — malware analysis report

Static analysis result for SHA-256 3753a9db82eb70a3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dda520308865c60cde3fd7be9c7eb50d SHA-1: a3d19d1041b921656ee78379e13f1d60e44d2b86 SHA-256: 3753a9db82eb70a33d04247ddcdc8befe32b99a2a3cceb3ee63bfadc155edffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary function appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ltmetal.com/userfiles/files/83568964125.pdf In PDF document text
    • http://rosabaum.de/web/editor/files/takefiku.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/lotapotax.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210903_E3986868A82B4981.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab3ef0ca5---tuzunov.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/kamutewa.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ca28965b145a9f853440dc2c619c84da/rovuzutiwezojukalomukal.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/44873804512.pdfIn PDF document text
    • https://phr4u.com/files/16986372604.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/93225635098.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/turevatizuweso.pdfIn PDF document text
    • https://okazionche.com/files/17157840641.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f977d84e6a---54329910333.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/wirarajibawotom.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/41820655178.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/87950574066.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/5397175449.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/zipura.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/dokoditenaroxuru.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/tawike.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/xutumemolipapip.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff3fade6b---47353120694.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613543452f361---36801810146.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/28484471706.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/pibazefugitazuzum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=zumdahl+introductory+chemistry+pdfPDF 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_off0000c59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59E 16604 bytes
SHA-256: d2ae5b8421af678667d246aef19d8339b0f83359137fb2f0d1bb4c2ca784d3e9
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 11064 bytes
SHA-256: c225b23a56748efeb3d4f56f06bdd621979f9f9bbaa124d9ceee60b9866dc11b
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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