Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddc2c578bbfb344…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 04:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d3434e34169b84198332c877e386be5 SHA-1: fe65bb05549e8faa6e2e12c8027024bc631f12b5 SHA-256: cddc2c578bbfb3444d5927de5fc12e70fd04571766a8c7060f24ea349abefe58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kfnmsz.com/upfolder/e/files/20210916221054.pdf In PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/74417232110.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_100245_119.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9243444c5234437195179694ded14026/75200807977.pdfIn PDF document text
    • http://aprt1day.ru/file/4563502270.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcabcd91cb---18538136371.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/jusojiwajorefavixokoweg.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/gipasale.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/82946823866.pdfIn PDF document text
    • http://inistor.com/ufiles/files/xotomidaxelolatilakabuj.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166a204bae---22951627636.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905025117670653.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/55680741834.pdfIn PDF document text
    • http://etkenkalip.com/files/wedib.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b632c1b1a---71644398714.pdfIn PDF document text
    • http://kgmda.com/upload/files/54615314599.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/bikuxuxumiwibuxalop.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/rewatutejurakidowomos.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/33658379096.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e13a0c0f---dukirudosutubap.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210911160922.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/21727916730.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143e9811a0a6---53244050906.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/76710204598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+gta+samp+apkPDF 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_off0000b77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77E 10588 bytes
SHA-256: c0398f7c18b66e96095a2019c3551d3fc57b5cd68a107fdd49ef45ea8af50068
font_01_sfnt_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 16048 bytes
SHA-256: e734eedaccead5e76922446a857f64ad21cc7339a676966a05df92cb385c7bf8
font_02_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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