Malicious PDF — malware analysis report

Static analysis result for SHA-256 a299cf4f48b2700c…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 01:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d33f44d9638760b7b63dd68ad5aa7472 SHA-1: b1c882348186de7834b327fa1ce2f52767b27998 SHA-256: a299cf4f48b2700c4dd86fc11e09ba9fd745b2f157bfa378543987295c0ebc1a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous external URIs and is structured as a link farm, directing users to potentially compromised websites. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=krystal+clear+deluxe+saltwater+system+manual PDF link annotation
    • http://nhs1980alumni.com/clients/878257/File/73581698119.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f1e5403b675538cf681b5992f4bfa136/69560123113.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429000438876675.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bikizikixodu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a8a362632cb13bc03765dd5fa4e6b0b/juzefapofaluxivemubimamon.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ead90e1f---wusavigetogorubevipaz.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/78cfcde809bb7902c44c34facf7b9f02/32638856462.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210617_55D42CFD851A201F.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/afca8a51fbc40553a477ae50ea074270/bejefubokawiwegemugupezo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/81t6ufue5hgd05dru1onnn8ks0/tomobitukuzasitar.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/66285977177.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f4490877---2835328249.pdfIn PDF document text
    • http://focostrade.com/files/20210612090142.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3157b0bc0f---gesofafedojugurebid.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/6ga61ed69kl54j4bnq1cekn4c7/4905979115.pdfIn PDF document text
    • http://specimport.by/files/files/vopowadapesubuwefugujej.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a9b2c04c48fdfc84703b1482a73caf30/podopizamepadebakoko.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6vs76ik1bc4m2hr4ns2uh3ju84/84104787402.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e29a343bb517447bb86e1f2649ae061e/damasujiraxipukuxab.pdfIn PDF document text
    • https://adikketiga.com/contents//files/98076349150.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607329d0aa9c2---48237197975.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e8c4b65cb9835cae3d31eefe35b64f92/56053472010.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/rizazojoxov.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_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 26072 bytes
SHA-256: 2b88bd5ee6238e31171c054861ee93e9b44d9e94993a16a17be06006326254a8
font_02_sfnt_off0001474e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474E 10712 bytes
SHA-256: 61e9f2b9af14eb589dbbdcb4b891410a60a09a2bfb8e19e4f18bfa091b3abaec

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