Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff8ac5ee072efa6…

MALICIOUS

PDF

58.7 KB Created: 2021-09-10 08:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ef5df4e6545817967975af670feb7d8 SHA-1: 91ac0c23635006159f6f562c152a1bba39e229bd SHA-256: cff8ac5ee072efa624d2c308b899f98541e0e7bf727c999ddf74ec4d3a601932
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, while the link farm directs users to potentially malicious PDF files. ClamAV and ML classifiers also flagged this file as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7549

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://synerhu.ru/uplcv?utm_term=thandra+vazhiyil+thambathyam+full+book+pdf+free+download PDF link annotation
    • https://enerjimakine.com/tsrm1/img/userfiles/file/72479285356.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/10/21094806501.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/47577648782.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomor.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/talisifin.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed5023cc0---55372900524.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/xofezifu.pdfIn PDF document text
    • http://vititanon.com/user_img/files/96052991373.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vemumum.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/perefex.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/45970286634.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/70527361830.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/81587168895.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e0ca4614---4484650516.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/famibune.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/78233801892.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/79288465345.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/75e6d2cda8d81475f20b80ae04c60495/16627722212.pdfIn PDF document text
    • https://electroagro.es/pub/files/vedoxew.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905161806773796kfj5ua.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/63574015900.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jezafoxatatifumaf.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/rumesugapakuxa.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/83040933281.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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