Malicious PDF — malware analysis report

Static analysis result for SHA-256 1040aaa9eac11c24…

MALICIOUS

PDF

93.3 KB Created: 2021-06-27 07:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e859c61e9a4f1402afbf796704e84e5a SHA-1: a484abaf9df8b134f2a2c21031f36823f2a5197d SHA-256: 1040aaa9eac11c24d6ba2a96399b0686d6aa52ce9bd4c05fa6b7f3651793ac9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm intended to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely leveraging a compromised CMS upload feature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a8dfe79c771aefd6f8b46533c9f13a72/wurinapabujulizifulenuke.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sixitazinesowerib.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/solujur.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/49567701890.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/tasajilalunobaladofopa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0nv7hjv081vuo633bvpoea5ene/gekamawo.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/56960793705.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9029b61b4861c46829301ec9bedc2b01/82063865733.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4bd1b68dd---sixezimajatulefuf.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/s13mt06gns3jma4p78j3namgdk/bunoravurafikuzusajojifi.pdfIn PDF document text
    • https://x-software.cz/data/file/27908784477.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e4ef06eba5442cf131728a7c894ae6ef/24704299511.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64f9da474---23799676494.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zakomed.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/91224262499.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c98c2ed9a---zemavosozimogezixifamoxo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a396b879b9e---joluzudekopug.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a54247fd4---38158935116.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/08a88e21fb457b5e9e126da6e2187129/15037109059.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4e201d74---wafositibik.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d52be9e4a7b84dfdbaa144413d28493f/31342287763.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/184fff5bc33a0a4cd2f72957f19a2f9c/89499640485.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/bivexirilegupopi.pdfIn PDF document text
    • http://goref.ru/files/file/8670230174.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/mrsdfohgtmm2pr3ov53fcvt9vg/89771971501.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942c73f08a8---famowefafolariwes.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9188441d---72747094077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=consoling+quotes+for+a+broken+heartPDF 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_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 17012 bytes
SHA-256: 71d6ca85a2041b296dee29a1972f77947f64ca7a69c0fed9649dd739a1cfd00e
font_01_sfnt_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3C 11000 bytes
SHA-256: 982a7fc87a543836425d3cb1af1af3907d9d474ff7f668056e6f3c8a6fba7080

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