Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f62b5ad2b4b4e2…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 09:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c49b0d54969d96233f1f7efa37262bd SHA-1: 8afbefdee8f9f62214ca68e554ee35bd67498b8d SHA-256: 86f62b5ad2b4b4e22114744d1e00d5a1bb60855ecadf67ab54b09fe24d1a7ccf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous links pointing to potentially compromised or disposable hosting, identified as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://webursitet.org/Files/file/vabopedonokujajosufetak.pdf In PDF document text
    • https://proetcontra.hu/userfiles/file/19491386268.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/tasedewo.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/nepowalepupivagoliles.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/gamurur.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/34843219603.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51dc0ce52---sejumuturavubiwo.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/tewawiwadoba.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/17908156883.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe8a2f0ac---fumag.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/49321613160.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/tedumipomonos.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/75888094303.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/2492492515.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/24614211721.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/vexinariwefopafixe.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/ranedemopatabejasi.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/rutamojabomitivuwan.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/40575592212.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/vopizelap.pdfIn PDF document text
    • https://riwg.in/userfiles/file/sapoturinaxuwelexajobo.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/29991580565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+new+tom+and+jerryPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/614a787a7c3ae890c007dd97467beac2/18331292003.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_off0000b7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CF 16384 bytes
SHA-256: f0c37daa586b9afc0fdb516d5322d3d2780c84fa9b581421c347284f9eeee7a3
font_01_sfnt_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 10500 bytes
SHA-256: b5c5050d5532d10e2daad695673704d9730e4a2a512e3b384bb831f7abf46a94
font_02_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1