Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc758958b23c384f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 03:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a52e72334d5862438a127edafb40707e SHA-1: 26b956238dce09497d98438008d0c153a3c1ccb6 SHA-256: cc758958b23c384f9fa42937c4bef957c913d8d71173daafd2815d1e93208145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://laborke.ru/uplcv?utm_term=ashrae+standard+55-2010+pdf PDF link annotation
    • http://soupworld.de/upload/file/natotusawubabu.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/biviguvoxabarosovuzo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/5510672882.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/tmhvh8nf32728ma8fj7ucgj317/vubikar.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/rimabegudijatetop.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2b6e513222b7fdc47aeedca8d96f5fc0/vefotubelurozewaxowukif.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/kikojikujutitebopik.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160f5a02210f7d---bepanofuni.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c8a710acf57aa96002537a1b94be8db4/60721756089.pdfIn PDF document text
    • https://autoparkalbanese.it/file/15569970896.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/rebafibasopukalorubeba.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ce323d510ec---82695044709.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/13603020911.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dca62aa19---biguvowukesawiw.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98b01e4dd---18797000741.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743df7d2843---golisemavujoxapejasix.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/33168136915.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/ramodeje.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/84665814255.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/cd7mq69hb93pp70fs29casnnvl/3115054647.pdfIn PDF document text
    • http://voijin.com/userfiles/files/15217322921.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/kibikinajogoli.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/bujajewuwemimol.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ca3499f80---65806813655.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_off0000ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 10780 bytes
SHA-256: fe25dbaaafd9f28937ed1daa04fce86364086a838f6163f69c51e67429ad0053
font_02_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 15772 bytes
SHA-256: 71df925e42acf66953e0d0f86f6f68f530b3e10c8fcda6eba890b9c7e1fef3da

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