Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a3978f19d50489…

MALICIOUS

PDF

98.0 KB Created: 2021-09-04 02:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc17cef7a10be03419348cd158781cdb SHA-1: 03b2d653f590b60a762e979ed3401c93f5fcde55 SHA-256: c7a3978f19d50489e795d3bf6ab13e039a75c32558b3a582330f494702d1d7fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and acts as a link farm, directing users to numerous external URLs. Many of these URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=derecho+constitucional+chileno+pdf PDF link annotation
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/lekiwugamodaraxenuk.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa100bb542---givejuzebikupuzizinitejaf.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/gawiripesomelipe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9b729d82---67442229970.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25d5174c82---80432738771.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/91fd364c94a7edd97304d7fbb40c0116/wikuwubugibojoza.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080416455783.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/72316589359.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/531ffd828a27961a6b875808b37c4cb5/xobesokoser.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/30356670676.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/55951265668.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/30371776390.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/3440002699.pdfIn PDF document text
    • https://petek.biz/resimler/files/93338151202.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/tlae37v9hjo96ajd4cujp3ghe2/wativ.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/60266477813.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/babubeguganomolosetunobe.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dokuwikasorozerife.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e135b90f6a121382cb54ee6b14d9e7aa/tilorovunoxerurizukirifag.pdfIn PDF document text
    • http://darstin.com/userfiles/files/zofusis.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde881b759---86517100681.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119ebca3ce---kezoxakagesokukadif.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf4af8a9b5---nimabononexux.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_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 10820 bytes
SHA-256: 1f30e7a3305c8bd1c25adf21fb27aea7ba4be677e47cb01b624b1e15d2a8d8e7
font_01_sfnt_off00012edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EF 20608 bytes
SHA-256: e2b208169653bd27a3f98593f54fa056a00d584cf143a3d84c4b1c9bf84c4382

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