Malicious PDF — malware analysis report

Static analysis result for SHA-256 7498719db5565b56…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 14:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 586d40267f654d0ed812b83c19304155 SHA-1: 3c9ca8a7a90cdfd58cc125876dafdbaff165dd8d SHA-256: 7498719db5565b5631e793371cd205a488e475e61d299b2150a1422225db5f7b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. ClamAV identified this as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of a link farm on potentially disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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://dent-pro.cz/pic/file/77407363831.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/pinejuzovo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20da6c286f---77190419876.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5eb34a3b09---54908044875.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2218672e8---lomuxesi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gsqmg8pkibe97g3eddub1odlbf/xenafemaj.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/17243872292.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/58dddfd2a14f89ee2f03b0ca3f963178/35265929790.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/sakewalenizute.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/fopomefeleneze.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/bevejal.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16089305bd1633---59305869404.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/45a483e4e2dc66ccfdf44f1c326a36a3/fodifireno.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/33719907457.pdfIn PDF document text
    • http://kalikraft.com/images/file/sibexavezivubebijasubake.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/vibemuredutazelegizedo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/f18viod20joqkk2oej1dsebvr2/76781681925.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/sonokafomozojugete.pdfIn PDF document text
    • https://terrach.ch/file/25548991561.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c64a6c5e---43836448817.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcfa9c155---79517408815.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/73833632218.pdfIn PDF document text
    • https://petikdaun.com/contents//files/53626505981.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///47321323329.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/voromorukonosinutes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rezolvari+variante+bac+2009+m1+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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 17232 bytes
SHA-256: da215d78fb809daaf60401b4f847cd9d6bc60fdb63f6fea3eee754fc23c8f050
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 11384 bytes
SHA-256: aab521838f5b81e39aea42a8e3c0472182c3d267801a587212faaa8224b0f094