Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73719d747865c8c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 17:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d82849d5befd9dbe53461b2c2bba5d2 SHA-1: a0da2955e7ed13070a4055229b5a7b3df0d97104 SHA-256: a73719d747865c8c1cde84548bac2cc2c25611bde5f67e8eb225900523e2cc8e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites that are either compromised or hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and links to compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://philabc.ru/uplcv?utm_term=queen+of+hearts+2019+full+movie+with+english+subtitles PDF link annotation
    • http://szcftz.com/upload/korekagiv.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a9d5b5cd---gasajofowekux.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4733a0f72c49cc96358647d6931023f2/5520530036.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/nudajujabikofo.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/61615664452.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/vabepuzukolipurupopiduf.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/95095335183.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4b658a19---kozatofowibu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/253e6a71bd9abb685da1b1999fa6220c/sofupenusomu.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/vareluv.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/sirivuvan.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/93196225958.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/pozutumezuzilid.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/23928403998.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/95920211580.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/44927571795.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/kewurejetefek.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/60629135683.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/73467703549.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/vezazalotiwufeji.pdfIn PDF document text
    • http://goldmustang.com/files/files/67778738640.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/susepeki.pdfIn PDF document text
    • http://vucert.vn/uploads/files/85526726102.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/03aa535c41ed6e5b85936f8acaa41d2f/26063442836.pdfIn PDF document text
    • http://aven.su/userfiles/file/1047153639.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_off0000c1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 17996 bytes
SHA-256: 0438a6e76cd2acdc1a6bd33a4fd3fbdd006afcd120d5f1bbfdcf9f2855698438
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 11576 bytes
SHA-256: 63c17a45349049c52288487845d2e59b650bacfa235c96b69317518cee655784

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