Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bc5995e3092f86…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 05:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4f0b2d51cefff78ac6a2961f22219fc SHA-1: d1dbb87c9ddea9cdf398a30b78e79f15c8e4ad17 SHA-256: 48bc5995e3092f861ab5a14b4408aaa03fe0394b72b8c489e28fcdb071e173b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://archi-m.ru/userfiles/file/burodigapaloloda.pdf In PDF document text
    • http://seksdagen.nl/userfiles/file/89155177976.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/katerub.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/soxofomizarosojobe.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/ratesisura.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///23733083126.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/duginejetasodemudu.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/90139052673.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/delurulexex.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d667d911668e2ef24602213af6afacce/katinijonibawisekoxijaf.pdfIn PDF document text
    • https://ip-pharma.net/data/files/maravetavo.pdfIn PDF document text
    • http://montesantangelo.it/files/files/bajukevokok.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/29180023063.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/16877926342.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/tegerafoze.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-8/20210908135629533431.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613206a3e9c27---derozijiniletevibojas.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/norusobalol.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/26404758938.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161348e065640d---3841871719.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/88535331750.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/16671289080.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fb833dfda10bf6337ecc53518b807b03/11302309230.pdfIn PDF document text
    • http://pasaru.com/upload/files/jekulebemanusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=unable+to+connect+to+personal+hotspotPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 17672 bytes
SHA-256: f9ecb4b6d6285986b774c2e2415e7bcb6ff3a88e29e3c1e1739f9c27c8a18d78
font_01_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 10524 bytes
SHA-256: 38709c310999eea12b816f16ee420f5c24f59d6012a0d1b493c2a22f2a87cfbc
font_02_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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