Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c82945e41d5f6fe…

MALICIOUS

PDF

95.7 KB Created: 2021-07-18 12:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f9cfbe8f65758f3f82a9273cda026fdc SHA-1: 2c1fe56a33c405f5d80d334ab7f6cad1e3df1d01 SHA-256: 0c82945e41d5f6fead936d483a986e2bb747a885316e5e8fb64bc12957904685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99aa24970---90810814336.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tebosiva.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/37246098507.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162471416619.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210529_45C7CAE076AF4A9A.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/tefumotusoxiwixizaw.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/24058664296.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/51bf9197d7ce081dc833394ac32047d3/75517672393.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ufnf60fut7rmsq749tj7hm8s23/xivutoxeboduwugeguxexa.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/pufiwizawivapulif.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098dd4fbad84---3391158654.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/kggt895bu7sim5mjls255dbaa0/54165292305.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tb59cnkgqglsp9olcbg6dmh97q/bibekuduti.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/lazojubunefixepebibodifo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j93dnv7erq4g8uca1n3sdm76b4/16959663736.pdfIn PDF document text
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b475f355cbf---16215695123.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/390d5fe2b6e81765a07fcbde13ab3bd3/lekajekuwudufumofofukivo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/hcq3da3afsf13jc6h9ds3j8h45/leguk.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00f831094---sukamiwawujarun.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pesopo.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/88161370060.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/95652008734.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/82767176330.pdfIn PDF document text
    • http://jucal.es/images/file/20819470115.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021716174619720.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a451fba24b8---gidejerelukukonirunagukuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+ringing+in+ears+mean+spirituallyPDF 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_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 16744 bytes
SHA-256: acadde87d19ad7dcc214b974a0aa17f67711c86fda0f0eac903f1179f797c596
font_02_sfnt_off000157c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C0 11044 bytes
SHA-256: a963f6df7adb4e65bf192f73a99d23558bbc141c82ff495349a984739c099ea0

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