Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebf94c33f4dd899…

MALICIOUS

PDF

90.6 KB Created: 2021-06-27 21:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 454b3870c38034d66cc108bbf52ebe24 SHA-1: 8b716117b660e32b03e9063a34fe7afc02c79944 SHA-256: 4ebf94c33f4dd8993011247a547cc5a9549e8b88af674ea932c49435330be350
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the use of UTM parameters suggest an attempt to manipulate search engine rankings or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://roxburyhs1987.com/clients/63080/File/xegegorelajilibos.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9218ab7cc---jewafuzove.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b2277c2e---rasuxojebirotidogop.pdf
    • http://firmen-bekleidung.at/userfiles/file/wiredut.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/csi9ecp7edqa88re1rf0bor7kc/rumunu.pdf
    • http://bettaletroom.com/file_media/file_image/file/segorulupopamolasitupor.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/dv59a6n65i38miragjka176791/81926918843.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6cc537458306545523bbc2fcbe979f90/viweninarajimifewivevafad.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc519f91d---mutogoselidijelovesubud.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5b376f04---42109805084.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3314abc883edc80fcb610ea203a0689d/66722355964.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027bc3923d---malaxanowanigifemovazov.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0s6rn8q8bh4f4rbacb3lhhut17/33079093398.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58348696dc---95567854120.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb39563bc8---69049875176.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d29ad96fa6f6d1e8348fdfaa3efce585/koxaleweresenapetekiva.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ca9efe34---xudavabojumizor.pdf
    • http://kotolantopeni.cz/file/kujirorusebabareralibati.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072684a446f3---falonatasowajeso.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bfcf5ad8550---vipizovamaxaxe.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/iic47bbeo0gkkmng2kmplr3vp5/nunatibobeteravenevafite.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sum+of+geometric+sequence+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
font_01_sfnt_off0000fe94.bin
a4fd99332ffcd2eb22a7342278f64ae64752d4a8b266ff4ef3c26ee693e555ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 11072 bytes
font_02_sfnt_off000117f2.bin
e698c5b0dfa0649b6964b3ce2d9a80555a0776ec813902d7dc96b71a41663b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 17412 bytes
font_03_sfnt_off000145c4.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145C4 16084 bytes

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