Malicious PDF — malware analysis report

Static analysis result for SHA-256 676da260eccc0cf3…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 19:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7e33ff77c48101fa3baf2da11c046e96 SHA-1: 04fcfc7719e0bd6ae44a2df8afa37526eeb0e199 SHA-256: 676da260eccc0cf3123fda1b9fba2e3dcba35d35dc2803570735b3b121cae474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and potentially malicious URLs, such as 'https://coretry.ru/uplcv?utm_term=people+born+on+may+1'. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the final malicious destination and distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=people+born+on+may+1 PDF link annotation
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d82618490bd3781db152db066f570934/98614724654.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/97595017871.pdfIn PDF document text
    • http://asfalon.com/__files/file/bizopiwivezaxaru.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j8rd3nbhs6ru486slmk50la83d/70768634181.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ad39d46dc---7815627616.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/rkgo23vg3vnptm32jacvukn18q/xiwoxumulexuwado.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755f1c503a9---nopimi.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/61432537591.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a508bb2a613---37985148869.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgcg282ptudfam0rvf1fpgpu9u/bokirulapokulapu.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/72838790892.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/gabovufosuxazufubizejife.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a5dd3a36ea9952fb5347d66486565d74/neferewuzewo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/vusexiroxanepusizisoxuvod.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/diguvazopidijedinixogilo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8251ce506e64e4a76945be8f71de1035/34730843697.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8iae3l94elg38p8dsfiknmglti/4523538268.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pc03kmi764k9uoeejq5foaf5k3/nigajomiguzisaj.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/37525574878.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/88333381465.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/tunoganupesebazakemem.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/97479085155.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/6161bfd6dba3c4155b0062a30ce3bc87/99595242166.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_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 17232 bytes
SHA-256: 9a942269d14e700416b1de39f62036a313a2b4509cf93ecae0769a81eed0867b
font_01_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 10364 bytes
SHA-256: 27defb5226fe9f54029830fc739e073fdb58730f3d8dedd65e8fe837d5a71dd7

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