Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f826dbe5aeb7eb4…

MALICIOUS

PDF

87.9 KB Created: 2021-09-07 22:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ecfd26774d0cd265d8fd2b5775fbcfa SHA-1: a7d5f3c05a923d92171bd42e8397611453afcf57 SHA-256: 8f826dbe5aeb7eb499595defe863eb893b6ae9dbffb602f677f563c2b6865d46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit user trust by impersonating legitimate services or utilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cleangroupbd.com/ck/upload/files/sijefawip.pdf In PDF document text
    • https://heatingboiler.ca/fck_upload/file/zawekisexenusutaxarisudis.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/sovasaworelovu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311201040e3---bezoperoriluxiroburumak.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/44899424898.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ddc058e5cd99b53a08245e1a03fa063d/13198804784.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b87bd6243c---binisikan.pdfIn PDF document text
    • http://sdds.be/userfiles/file/42829064500.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085c206bae22---wawidelibide.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sajidaniril.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/qpdsvgocs6iuabgl25saaq5rr6/9099241980.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/20038357898.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16107ea17c1066---gugureridaxo.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fowetezoluredexudiderur.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b81d205eb337ec6cec9fc4a8a4fb0b8/bumibadojoxa.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/18464795708.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/64611111805.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///34217610106.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f21b9887d19---buvaginem.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3b036aeca3d051b9c551247a63aa9a87/82450127533.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/dabuxazasasutikulelaver.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/60719438631.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/80296632741.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7a10c40d31237a0d60c6e3ab533c170/bapoxuzigizon.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/74315890534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=scanner+fujitsu+sp+1120+pdfPDF 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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 17500 bytes
SHA-256: b87833c278d4f66d3316f9c96f47ff62a32541f247459bbb3f23b57a887b91e8
font_01_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 11044 bytes
SHA-256: 694a6523bb5b474357a443f8a890d3064b925ecec82d80f1c37567f539ac2abd
font_02_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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