Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a12d323b9b7f1c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 18:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe49dac6adbd309a816decb0c29f0c80 SHA-1: 7c8c4a92c8fa85c1d2f66c1abcf0952e26e63cd7 SHA-256: 89a12d323b9b7f1c09c7cc1b2172d5b732f4a8acfde7e303e5139e139e54218c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ea1484e84---nijebonusuvupokuvugo.pdf In PDF document text
    • https://evpersoneli.net/ev-personeli/file/90169220129.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t7qf6kh5i3rj9g24tufbv10rgb/vovijirazofusolon.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xazoruzaguw.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd328caef5---3555136059.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/469399053bb7c25f87a6df51c0fccd81/48154419725.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/fatewufizozimiwefijokif.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/xomezaguner.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/18003135381.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/19272125632.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/pilixozawanozopen.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2p257d2eonheprqrsrshcamq4/27344782935.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/zametexabegixed.pdfIn PDF document text
    • http://willbramephotography.com/pudodaridiziwamusekiruvi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a093e0daa04a018ac1a63cd4f9abc7ac/zejogogadutuluxepover.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/laxofupopujukapuvivo.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/10363936843.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/2a8496841e95b6464a9b1f17932aed98/70116779223.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210523093426.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/69874965555.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/65202839414.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/23815125347.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c95b5224b9---bovagojavigizuxorobapin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chemical+dynamics+notes+pdfPDF 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_off0000beb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 16016 bytes
SHA-256: 2952c3b3368070721a3207e74b35dea3d2de700db7c473b63c4d83512afe072d
font_01_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 10932 bytes
SHA-256: a8378092976f9a264c0eaaa790ef2fb1e94d0cc7f29a96e8c81eb3b790e6dce0

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