Malicious PDF — malware analysis report

Static analysis result for SHA-256 812e27dbe837bda4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 08:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63669f1f7a4fc96c5d8194ce92fd4853 SHA-1: 27686df228e2246ed710beba4177e46a29cec167 SHA-256: 812e27dbe837bda4c4085155e5bd935bd652cc2b327c5c1991cf85cb2f317771
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting further supports its role as a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

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.
  • 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://appchecar.com/ckfinder/userfiles/files/28465207064.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/65176445106.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210909142805.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/79438796732.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136027fd9b44---50915783541.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d99b88889---98369707529.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/sikadalifaxudal.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c21148d7---girikad.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/47251350224.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/26279845584.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/75555398083.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/ritezavased.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/zeketikap.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/7407792538.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210901_192853.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/48751003962.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/80603152196.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/40669925702.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/ronoz.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/lemivokipadulut.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613077f2be5b5---voxup.pdfIn PDF document text
    • http://schokobrunnen.com/idata/bisejadexoteveduda.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/5250342848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+can+i+print+from+my+android+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 17656 bytes
SHA-256: b6b5f318bc71c44b54cc18f196d521e444fb2b8cdee8230872eac54ececb7308