Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d027dac04ab904d…

MALICIOUS

PDF

80.3 KB Created: 2021-07-24 13:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53e5be2881f939c48945f02854f6e429 SHA-1: a0b32213110162ee324ce85f17018f2dcfe096ab SHA-256: 5d027dac04ab904da3caa874aa00ff921e2349a46eaf877e9582dfbdeaa6f91d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f84fa41ec7765113e276beaee44bfd0c/80595840477.pdf In PDF document text
    • http://aylincinarli.com/fckfiles/file/85582061994.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/kasinitaw.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/66095577789.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/kisix.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/90210319953.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/t8rmhrf5f7b9gv07025hmbj61f/26572605810.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed72a52d0---26748867841.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/eaa917e535745b701c0b3eb09b063153/90941255207.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/4529607802.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/nokusazevirazilikinadom.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/17163584489.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ea3f7afacd572b02404b4645ad3731e5/2273240796.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd35fee5db---60137926130.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/16678841026.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/xukurebodejop.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/23073842195.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1dce7069a273a5e7919322623bf92bae/40899915979.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/44be3e3e292e46adb207b5b087a22caa/4453432097.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/23a15c37ce6050b599f424aa4440f260/8888444924.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/289bd7a76039a24d16373f16c363b411/60249537625.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe476ee152---rederemojopobugonuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=marketing+management+book+by+philip+kotler+15th+edition+pdf+downloadPDF 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_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 11388 bytes
SHA-256: 96750cc960b708dd12250dd62375fc38d7f2c62f89fdb25f2dbb74012bbd1464
font_02_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 16876 bytes
SHA-256: ece915c30f5c411dbe05480177bcc0c4e113e7588911d4e195689261a523f8cc