Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e26b4ffccc8bc4…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 13:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abb5230892520069aa4273d457b6609b SHA-1: c9d52608f19f25f421462a3df7e922144160d611 SHA-256: 84e26b4ffccc8bc4adeb026fbacfeafe4df4d5a0b5ff1d738ca5e4f7aaa3e078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://nic-irq.com/userfiles/files/vabamala.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608937a8ce168---wogub.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/5110649032.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/300b8eedeb6d63367831694f58661a91/wudebejiwujezolabexum.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6suitgcjq5ita5fp50vgj02kq1/kozofakezekevolodapegelam.pdfIn PDF document text
    • https://emmaushuis.org/pages/18184198082.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1855b37894cd911a50d5067409fbed3f/79018475482.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c3f952b7---41134759614.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/nidepubenaxo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfdaf2dde1---76915436229.pdfIn PDF document text
    • http://charivne.info/images/file/51440968280.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/ruxijotigotalo.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/vilosimug.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/94c6310917476da29998b2f6ede5ceba/30610562620.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607168c7bed2d---jozulomamutibewatofepened.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/66624394946.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/15157057244.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/49452625023.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca410b8a76---belebo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/46061224910.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/rudizoxax.pdfIn PDF document text
    • http://ahchala.com/img/file/fasafazonure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bmw+320i+2008+manual+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 1924 bytes
SHA-256: ecbbb0f6608178d3fb094632edb68369eef8e02bc1691d90310dc8fe465ebff2
font_01_sfnt_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 24516 bytes
SHA-256: 97c99da4dfa6c7ae792e6f5ec3fa80a1c03270657d308419558ecae5fd3e4990
font_02_sfnt_off0001153e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 10900 bytes
SHA-256: 1915f45eed6c844990b08956bf9abf44991f72a32a908cf88ce2cee75c798a23
font_03_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_04_sfnt_off000143d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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