Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7bb8eb7020b568…

MALICIOUS

PDF

97.9 KB Created: 2021-07-06 23:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: efc5ba11fdcf726ad33d1ad632f592c2 SHA-1: 494b66c4ef20fbaaf70f8fb274bd0df6686e4a95 SHA-256: 2d7bb8eb7020b5682743143a6fe82daf828ad6a1e11854d7bfd3bb04bcfe4b6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The embedded JavaScript stream, while not fully analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or initiating malicious downloads. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=life+history+of+great+personalities PDF link annotation
    • https://twr1115.net/files/fckeditor/file/fupakejabelizivavez.pdfIn PDF document text
    • https://numberonerevolution.it/file/voximabunele.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d37b16a30---rebuvuzawanakoleralux.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/73462827576.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jsmrn8jbesl130bv3uejuhjmjs/gopifo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g1quuu497hr7npmomn9k2kv1v4/zovebinakume.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zavagabinu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/05250e44aa3db1ebc91d07645998b84f/21486238477.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbaceadf5---kuzawadinezibonixagil.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2c121d4ae4f011621463d66d3f9d39b8/laverotenebam.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/menozalagixigibu.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/1914313203.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c15cb415b---rilamajelagizefudavavu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/99442938879.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vktupfqvn5rc0o1f1bdmv70rda/vivifewajilo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b29902224---fegozagozifaw.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3ead238416647a468e973e2351956146/58903066528.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef773a7699---79501425029.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/3622011021.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/pq343jjvf6ofrnkml54ehu7b38/dopara.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c54e1d57f---686869045.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/nowusinegowad.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16086199b39b99---72970708643.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/llmj72dt0h6ooabkb2h46u1vh6/gotexupuwerazolujesapisej.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210703160542.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_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 17200 bytes
SHA-256: 5d7cd7821d61aaa9e6f10cc941685cb3d3a0fe58d8324858355176ad2bda44cf
font_01_sfnt_off0001497e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497E 10708 bytes
SHA-256: e8499b46cdaf798f09870e5b282289e3e0d2d1a214e9f8897aa651d5d10d910b
font_02_sfnt_off00016214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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