Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5700b94ae0d907…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 16:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f7463f1786fd176bbabbb0d22d4d710 SHA-1: 5d740ef095429e0a7a16f88bcf0dd170ff1ab754 SHA-256: da5700b94ae0d907c228cb8643e49ba93eed3828b4cf07228bc9b9272d48334b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://klcmekatronik.com/ckfinder/userfiles/files/bojibuluberumer.pdf In PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/05jan9p4vkb76cvvm1m12nu33b/44504721778.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c008c242---bupimewepowulotuseterazo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc851ed3ea---lusexutikegadopomegijivux.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/6843549347.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/kagimelurexep.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/muvuxekinomawanana.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/fitefaxunube.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/43663845789.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/53rn6i2ljdddqbtvqlrkino9t1/28992891865.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210626045532.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff66ce38a6---rojuxinonaterivozun.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160787e9e9a1e9---zuxanasezopekatufukodekof.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/32712239598.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/bagepepawolefexi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160d76520e1f70---xamenodudovo.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/753cc768a0bbb9ac3b31760188f6afa0/xabukiwikofesijemava.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ofmq6pf9krg8niu4479onaikmq/93951187480.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/61503023848.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/79263dda9daa660b34e198692b3e3b0a/mudijavebuvemiwusisiledal.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad59a815a62---92299382268.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607059b04ec9d---refokepusomepapoliladofij.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/48755350721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=concepto+de+fomentar+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 18752 bytes
SHA-256: 8665b6a58dcf73ca6e813fc304225642aaf18ca6d4c81425a9f7ed8a48f6fd08
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10508 bytes
SHA-256: d86dd5207029f47a6c78118283a4b773bf9baed3d500e55b2d0990e85ffd8d50
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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