Malicious PDF — malware analysis report

Static analysis result for SHA-256 6789ad10ef75dbe3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 01:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e89e25a3d42f18bd64e7df420ab73e2e SHA-1: 0c52a93acf426464be2d9e766a0a8505f92ea171 SHA-256: 6789ad10ef75dbe3222524d3dcd28c99a4ef10a5315325d420092e55244506a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The presence of a 'download button' heuristic further suggests a lure to download a malicious payload. While no scripts were directly extracted, the PDF structure and heuristics indicate a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://millenium.moscowfashion.net/content/xuploadimages/file/47703727286.pdf In PDF document text
    • http://thecountryclub32055.com/userimages/xebosupubajiwida.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/dizawuruvaxunim.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b73ab98b2---furibitirorizupop.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/mowunadixedagejipugi.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210913135538.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/ruxunulivotetikikekojez.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/64800669652.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/tomakovetime.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/korivigaruvok.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/46852924020.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/jevinetolomanej.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/meziwaxososonitaxafimude.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/13601249597.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/dasuxedaxoxos.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/27035723551.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/73246373668.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/galawewozapa.pdfIn PDF document text
    • https://t2sc.me/userfiles/jeroxexog.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371ad6e9730---17666608185.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/nanufofagatewife.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/7488693354.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613478371d77e---tufopevoja.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/76697563685.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/68450038369.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc1c50e78---lidigulajoxosufubezudebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=high+quality+ppt+to+pdf+converterPDF 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_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 17564 bytes
SHA-256: cb589f525529bb66aa274a50034337082bf11a9b6ba69ba5300896241978d7a1
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 11148 bytes
SHA-256: b75d51ffb721c6b12996a6d08748b592efb7f891e52ea4ef0b1473984ccccb46
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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