Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e66dc8b4d4d4930…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 09:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca937673e66ab9b062f0410fa6e556d1 SHA-1: 5da911c9ac5f92e2248eeb241d6356fde6daa945 SHA-256: 8e66dc8b4d4d493026d632ac8df2af5f57eb2839f0e00268331c641b6a800d2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or malicious content. The presence of external URI heuristics and link farm indicators suggests the primary goal is to redirect users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://garglob.ru/uplcv?utm_term=call+of+duty+apk+2021 PDF link annotation
    • http://perlawarmii.pl/userfiles/file/70481374236.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sowodi.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/fanedodepupo.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210911031746.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/109ldrhc5omp7l423mbpt3qpo0/28066925915.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/dopul.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/jafakojarinazuk.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210908083534.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/guvarobabirunuji.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/fadipasaw.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r9lmnd10tbjue6ljp2ajl8jjk0/62701049646.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/27161646505.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/zemonemiminobibe.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/pepibef.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/44982279350.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/fodaditazevuruzajijarolas.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sowewureda.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/tinuzobin.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/84723113341.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/59266954204.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/xivurekasakuru.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/fawowureto.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/vazuxorudanatefarefunif.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d31b8603---28025559716.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 10528 bytes
SHA-256: 7288ff3896bd46b6bf93762662594b61a1cfb99593b1b76400455aaa527a311c
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 17160 bytes
SHA-256: 343c43601e17bfe135a8330276ec83b9dd22e433a8995441d4efef803204054c
font_02_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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