Malicious PDF — malware analysis report

Static analysis result for SHA-256 127c0ec3ad278f36…

MALICIOUS

PDF

109.2 KB Created: 2021-07-13 18:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48677d1edb1ff46302ab0764e71bb242 SHA-1: 1a6b75c8b4d17d020d5d3037d6e3550dfbed5526 SHA-256: 127c0ec3ad278f36ab443d860ed9868d7f17f8c9a0627335e97d823930e85c24
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting it is part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=central+time+zone PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/365ufur0u9pm9eaghce1qf8mv3/41997642444.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb6681ce32---jututuni.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6a9ddc26e---kitafikunudarada.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/nupelutafokevezu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2620a0b7f---59998079674.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d42a523183d---46179841512.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c3d583ed---fujarokilixibafal.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xamivegegigubarenuregaze.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a736e7e791c---soxuvesen.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/29a2q4bpkcbbgp0e4fa2ruca2t/xokow.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d069229fe---polexesukuvanulibimusig.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a2b6b484ec5492c79c528afaa9f7390a/6483895700.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/30533423180.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/289c18c6ee099e3b9242f39ea6a8425b/96959243581.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad412dac52e---75424972689.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0aedbc928---bapumoxam.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/niwakemobiwibanawiku.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e20e7ae96---3924721086.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/49675792548.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/47295862923.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zijowepowutakijune.pdfIn PDF document text
    • http://headrepublic.pl/images/files/lebudujoxiniju.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/38982738111.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/lisifirerizubujejawajufo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/810leo90uiopveilnhmprvoh93/36329180242.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/pixumepizamavukinikev.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_off00014803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001601a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1601A 10192 bytes
SHA-256: c363d06e32db5f1fb2bebcb88880c3eb44c86e9190a1e3c27ae05f232d5f01e8
font_02_sfnt_off000176f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F0 17960 bytes
SHA-256: b396f007b4c3754233651f38e16030861ff897e6d49e4abc4221d72e89d64c72