Malicious PDF — malware analysis report

Static analysis result for SHA-256 45eb4903082d0d17…

MALICIOUS

PDF

81.5 KB Created: 2021-08-21 00:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e46a321241b29a7048827584012b3014 SHA-1: 82b4d5ee20b9ae43c587f26da5f79946d17dfb84 SHA-256: 45eb4903082d0d17d9790d4f484131b0534f3a7b7b57b659d4cab79c9cfb87f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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://philabc.ru/uplcv?utm_term=how+do+you+find+the+original+price+after+a+percentage+increase PDF link annotation
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/zalofupuwelibozesidevuxo.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/kusofozagu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f9725044e3c---23971480676.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/87800524941.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e7d4d60ad2fe5d2e1e45423a78781778/45971943366.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/jijeko.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/96400622790.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8838ec9f5---90074405267.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33a4978ea9---78134408640.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6339ca7048---wonodesi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4d154456---92647900167.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lokopajilum.pdfIn PDF document text
    • http://erictex.com/ufiles/files/soviteranadokebilajub.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vosidawibaxekiramixoxez.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/13250563931.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/70106863828.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d317865460---21917023629.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e80404f3---77559982704.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/13419419003.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/9bcc18ff17c4d421eaf42a5e34046e48/99578246424.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/96978113692.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5b209bc9c685e58ce8fb73fceafacbb5/83143017337.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/305ff1c850fb7cd0ebff9bc8bfb52ff6/sarubelujonejirajezo.pdfIn PDF document text
    • 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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 11188 bytes
SHA-256: 3b10e6ce77c054d026b1eef76726493f80e44f34ba41850fd982a843a94edc02
font_02_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 17768 bytes
SHA-256: 8a1fc6ebe1c486a452d4ec7aaa501975dbcd9e0ea3400b2b4147eca1f010a6eb

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