Malicious PDF — malware analysis report

Static analysis result for SHA-256 901e906cda7a8600…

MALICIOUS

PDF

94.3 KB Created: 2021-09-02 03:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1eaf0a900c11b1637dca3f318b1a7cc SHA-1: 51a02d718ceae09b5deb76c9ba6ef6c210e951ca SHA-256: 901e906cda7a8600ae575e5f67dc283db303e645fbf9992eafa960d0d17ac542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://es-hanasaki.com/yamituki-n/uploads/files/83722283960.pdf In PDF document text
    • http://bkht.vn/userfiles/file/6227171996.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63071421125.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/54562080202.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/vegolegixezafuberabovi.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6e74888019be62829ed853f13e239240/nowiwef.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0035093d---23673017897.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df355770847b6d39f56298d03250777a/sovuforajaraxij.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/mivogusek.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/dopobadamoz.pdfIn PDF document text
    • https://telenovella-bg.com/files/wajojaniviturokobonetugej.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/37195751117.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28631876397.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/31718093491.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0392bd0f---zudik.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/19990489625.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161128bc185023---tubis.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/72552517822.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ac68762---17446486446.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h8tr6pkefj69vvtnu4vkbbk8q3/lokogepulameliku.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/wasidadagilizofiguv.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a81366d7115---87260627060.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/80281029553.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c71955d76---37156819949.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c716d5f6fd---17441977202.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831cc590b8a---32842407664.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/8983642456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=guy+having+sex+with+a+girlPDF 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_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 10776 bytes
SHA-256: 44bdbf6195b0f55af51494a323f6e350695966706785a7bae2f833bf5bf71c77
font_02_sfnt_off00013bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDD 18084 bytes
SHA-256: bdf66f7950127feb50ecc2c8f9f1b13855b2ccd063d04d2ac4a1ff2c85a8231e

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