Malicious PDF — malware analysis report

Static analysis result for SHA-256 5740da65f9b57f2c…

MALICIOUS

PDF

109.1 KB Created: 2021-07-17 04:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57220473331bedb57931d4162ab9a42e SHA-1: ce4911eb5da4997d2ac43dbb672c25abf2da3179 SHA-256: 5740da65f9b57f2c1807c82b7b9d48cfd297570d99988e1913f44fa76f4f1464
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs are sufficient to infer a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd72241e8e---vixebovujewa.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/pasedevaromesorefirove.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/49748531881.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/pubekuvubomogowawifesit.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/4066919995.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94f44c2b8d---fevolezuneromexedusin.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094426ee4e72---31808438827.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/dotupikiwepuvanuvuduvur.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210528132411.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dijibolujuri.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/75757119394.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/2616900048.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/tilifuvu.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/nofilolegabadimoregifader.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pga64njsanuehrlbhm492jdnk6/duvorisumutazolemuz.pdfIn PDF document text
    • https://hse.tw/upload/file/roxazasadixukesedigojew.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/26690325290.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e33812baefd---gaxikodojikojokapave.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831fd617136---9696325133.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/rofigegag.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/32479396776.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/65ab8ccbcc2c5f82f39325d41f72dc69/21270272226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=jim+parsons+and+mayim+bialik+new+showPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 17740 bytes
SHA-256: e2482d68fb72ca5d8548ee67aed604e6d98af671d7dfce4753d8f0cb3eebd6f2
font_01_sfnt_off00017626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E3D 10980 bytes
SHA-256: bf55506eb2aef4308906afe1d294544872e60bf2e43ce81d568b87f773e24168

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