Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef00b7f6caaf1fd8…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 00:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14557e60e6ae00cd94e255a9adc3dfa9 SHA-1: 207ae3883ac641f9781bad9ec029e1e32d52ca56 SHA-256: ef00b7f6caaf1fd8720fdda7547052c4aa0dcfc16368930ff55c7641f691462a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f252a6ad5c9c4db240a8ed63691ebf4b/zirafumaxovusetaxa.pdf In PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bf0c3a420---mimevoxuwupuxozifonisob.pdfIn PDF document text
    • http://gibisch.info/files/files/zideredokonovit.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/28657505738.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8f93abe874370a9acc645e285827a0e8/zozonujejanerosaxa.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/sakotutod.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ab4303d8a5161d1fe97e60c3a6265896/wimaguzeduvu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b6gqs7ks753hl3aaf2thsogbpl/milidosaberesajum.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3ab0b9a120634b7be0b6ce361900224d/gotabo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c6d4a5ecb117dab8422ce17bb379402f/degafuzomoguriweresenude.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/25308333379.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608649a07dc06---wofojutolodewalu.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/zazodifuniti.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/83073734484.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/22532815375.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/38913684628.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/60547489752.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/jilanuvolilutakezonegodan.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c778252c9b---nabonufex.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/wemogobos.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/tomikipibolebikalatidi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/lelitolilanug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=diablo+2+lord+of+destruction+free+download+for+windows+10PDF 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_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 17376 bytes
SHA-256: 3c3ff1b34c3f303d858a583faa9b279ccb92d6dbb525ab7923b0ea7883a43b7b
font_01_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B7 11088 bytes
SHA-256: 8fb10c6f21a1fa9f856593b260c9e731b98e61c408ac07e027082696fbf2ccb5

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