Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5f0bf4cad06a3d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 06:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5b35756dd39dfe7264c28ffb374051a SHA-1: 4a17dc2b55bbbfe572966d03ccdefe23b1fb91bd SHA-256: ab5f0bf4cad06a3d4630a9616ac0986e9d6fa33c9ff01fef3456793f51fce6b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=share+photos+between+android+devices PDF link annotation
    • http://unionnutritech.com/upload/files/xovamoxaxajuzepusovubifib.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxisukejigake.pdfIn PDF document text
    • http://zzquansu.cn/d/files/16252333980.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/89540307344.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/68891222959.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/purelivus.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/xotakemeboxeki.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/vawutomuvapafaxaponuxipu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/lorupisipetuxotogawi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aq8a8bgn54i3t2dp9415rt1i4s/41071323705.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/26240398590.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/doxizironep.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/pisufawitiret.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/21137496133.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/29ad73060efa50a789844a51a30884bc/sumesifug.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/ralapimo.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/zimegarame.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/rufezovovebitomiwe.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/81977712152.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/81095882504.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/90488853204.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/57790829255.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6a28bfd---wovikijotijapizuxawekazep.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7b2658be82ca8723219436dc35e14931/zibunifagokavesedikel.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/22649891236.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_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 17868 bytes
SHA-256: 3b8f942b8472bc1ca003aec0329f6c587bbc758c66f793f0c3f1785bab4cc2a0
font_02_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 10932 bytes
SHA-256: 6ae3e3fa0586b45db5d15be3f657f59d191eb7fbf22f7b197a6cb75d81b1fefd

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