Malicious PDF — malware analysis report

Static analysis result for SHA-256 434d41235e273211…

MALICIOUS

PDF

98.6 KB Created: 2021-09-08 06:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3383853d97f12d2fef6a54c9908d2407 SHA-1: 2904e05a0a52ed5321b5b0977e285c33b0948085 SHA-256: 434d41235e27321137f48564c76e9b48a5cfe0c97d27d40a1a9ee37090e81644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing or malicious link distribution. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c2365238d93---62195546227.pdf In PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/xemobezojewamir.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/83438382105.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8bfe962a---17869724765.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/78329793440.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9500396b0---jaworumajenuzidopeles.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e81211aba---romoguret.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/vigezimogaf.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bfb8fe0b7a49f25a539a8000b2c68500/xinifozagufixo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/8084801274.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611aea5b5b21b---48535925310.pdfIn PDF document text
    • http://scro.ru/pic/file/51224500953.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48867ef5b504818bb0c15063b44668d6/37357405794.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/vilop.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c88a17251fe7ca49c1a8e06601d843ce/45908271921.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/fatapevovuwirulewu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c341c885a5---10532016891.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/nosujonetalazu.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/39640410327.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c08c9d91913d74997acf7cd668324e9a/tekezawasisarubopopala.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/57986826529.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f4a5ecb1---lusemida.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607768b11151d---wosavajex.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gvrf4vu0f086unnc4no5vlj5pi/79640265615.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20218292141186231.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/56497516367.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a28268ea6---73916045900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=revent+726+oven+manualPDF 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_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 19352 bytes
SHA-256: c006a86134e7fef4eb91351168bcd782de77245dc47282ab9a6ddc0a3575df60
font_01_sfnt_off00014c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3A 10456 bytes
SHA-256: bc48333a0693ab769c6281648054303e683daee6040636156038393217451907
font_02_sfnt_off00016427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1