Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe2853b8eab6580…

MALICIOUS

PDF

106.6 KB Created: 2021-08-31 05:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11f7350c6aea12e5c6a18ae197fc2f9b SHA-1: 4c933e133b2cad23f78bf81361bfd34571ad3861 SHA-256: fbe2853b8eab65808100e6ae2256e352ace3fd69b7f1426db29c482f65e98b8e
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to IP addresses or compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/wimagemowugimab.pdf PDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e0cc9797f3825874fccb578081aa0e2a/29526094041.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/mirek.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/82166450677.pdfIn PDF document text
    • http://wohntraumgmbh.at/wukudorapat.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/lovoneranagorabajenego.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/zadabiga.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba30f3e20---panew.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ef032b0ad7b4c79741751eb35fa9054a/bilosasudado.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/nalasagodaxaxerojezapat.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/uds21j179tnbfr3l59t9jtbm7d/34728987681.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/61611042701.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/84911476953.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e9b74f0630e33add586b377a5ee174d5/zomugasojobar.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/11d8702c9c33efe2158253a807565345/44626220832.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070511034890.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1957dcdb4---88065574971.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/jarewexiwaverixexilawade.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceac6942e75---fozofogajoziban.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mafopifonujifax.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210606052520769.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1e2a8549---xadebibun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=open+cycle+gas+turbine+diagramPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/11694656236.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_off0001386f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386F 11116 bytes
SHA-256: 1f74009272b07a26d2de7583e416901f0847d724e4f22cee05e6797f9f84962b
font_01_sfnt_off00015209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15209 19180 bytes
SHA-256: ac1126952f39ef03e906c7b31275cb83e415a593760e88237e59d493831c412d
font_02_sfnt_off00018492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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