Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54f3eb6800ee395…

MALICIOUS

PDF

86.5 KB Created: 2021-08-30 15:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ec2f850ab96f0220035c84464696089 SHA-1: b60500e01a5b2488d445148985b1b6d724393e7f SHA-256: d54f3eb6800ee395c98ba8336023fca24b0b637d6585a174d10ca8c746b780c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS upload directories, suggesting a pattern of hosting malicious content on legitimate but compromised websites. The 'SE_INVOICE_LURE' heuristic further suggests a phishing or payment scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/fsdg3rn14i74f958kqqkabjiua/vorififududeforomu.pdf In PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/12849244626.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/13613735615.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210627211424.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdfIn PDF document text
    • http://cissi.it/userfiles/files/manukunewijapoxodazerob.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/fibaje.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5dce8da4---982121847.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210723_085656.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd2693a509---9106596545.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/feninuzowunireb.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1psgempkk7hei1jkuofcpnp63a/tekuzowexawuromuvoralo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/63366249629.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160996838333e8---jodozetaboxavozuxezekabiv.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/62726020879.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/av550jtrb8475ibfel08b2k0v4/nolor.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/bemetodikabikusuwetuxuzu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wefufusogerudenidila.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zajudebabodogazanafed.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e531d9e686f---16801628439.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/duzukivedif.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b623b5fa---84434126915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=meaning+of+frdPDF 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_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10212 bytes
SHA-256: 076a9961b3c0f0b1caa7c771720855ec0ab14ddc0d8380a48fe74ed4b4bd9533
font_01_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 21716 bytes
SHA-256: 52d4c7ac051579325c7d40ffc1636d5c9ce531557efcf2d477cce32cb6f029ab
font_02_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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