Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f6438d222e6766…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 23:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f105c1e5789922b1ff7ab666e2e3beb SHA-1: 768744dc138f9766a29e79801bea9faf996f1a2e SHA-256: 18f6438d222e6766dcf2a320aeed13ab628ef06070835da959c44c664f083837
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised websites and potentially leading to further downloads. The presence of a 'download button' lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://nhadep30giay.com/uploads/image/files/42532397080.pdf In PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/garikuzubagelogoxoxu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a9e98f3542202cc9cc581bd3f5fe13a/55877216106.pdfIn PDF document text
    • https://carlojans.com/cms/file/ponoriminatina.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2f967f754---bogebatigofelinewawopevo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/97939625048.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/76015526857.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/nofireraxiligoxozibetuse.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/ratasisizoboxumuf.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/fetajefexaropasum.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/mopawijejakezejegogedowit.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210726081738.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wezemunasi.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/26205672394.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/65650007016.pdfIn PDF document text
    • https://kristinanamaste.eu/files/23347615132.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/10427194223.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/mukamanetalume.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d767fe0ede3---87460192638.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/vopekizenu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/38bf6pa72cbbrc2gn800tnv551/19978539901.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/69582952208.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a39ba4a64bff2b86229f3399dadc975b/resapizifepobolal.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/77037674891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=athlean+x+program+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16928 bytes
SHA-256: 13f3d20c44db753011ad7640109770b94db70e273de73b7777d7c6d34188eba7
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 10856 bytes
SHA-256: 794c3367b73176f98ed68bbc26011730f37f4de36e3ff8365a628d1ed8cace76
font_03_sfnt_off0001361d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 18124 bytes
SHA-256: 9c7ee717af8db7a090ea501509eeb0c42c5acd266736871d18fc7895ebf9aa5a