Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a026dcff4c5d880…

MALICIOUS

PDF

83.5 KB Created: 2021-08-30 21:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a1b591ee4fa864549c2167cbd859709 SHA-1: d1428a21b42c33efdacca4afbc0f022079b1b4c3 SHA-256: 0a026dcff4c5d880c9d78dec2aeb89f53edd99647437d5c9da0cfc3498098eac
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/uplcv?utm_term=waves+chapter+notes PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02e479489---vujazonajo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88c3aa5f28---81714514343.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/74074333831.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/90516864433.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zikinibulidixisel.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/76446963846.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/902593b03f9d2ac2c5d18200c7fe97a3/sobifumavuzin.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f106c8ec719b8ae6b87b7833e29096a6/filinetaxijujapazusi.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/20392827954.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ebca90ac096bca0ef12c63301682040a/dodazukefesadoroxe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20ec80820---56123754768.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbcaf256a---zilonomopuzinafikajeso.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/jijevikinu.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/5n27tn2g9972jsp18krn4ncg2q/50397545433.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/93931834479.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5a678d34d812eb5e9e34eea5a6663e76/62330661538.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/73170335612.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/25814459758.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/mojis.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/padixivisemorejuni.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b7200bf4---40411092530.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vmp65b2iqe4mi9ibjhsk90mg64/vukaxusibajelubejerigexiz.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/mu2pakhs55138lo0ak38n67u42/popanigapipig.pdfIn PDF document text
    • http://rld-carbon.ru/file/pusepid.pdfIn PDF document text
    • 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_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 10392 bytes
SHA-256: 1704a7b9494f30143d598f9a227656b0434613c1caf071bc690407190c367d04
font_02_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 17840 bytes
SHA-256: 08ca7f164b993c311f84fd02f3f4cef53ca4a2c1d42e43f9dbb37b316337f6ad

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