Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9e5ad6490155bd…

MALICIOUS

PDF

85.6 KB Created: 2021-08-16 03:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c36c16355c9699be7864fb3a47d3c951 SHA-1: 16e966199eeff5f9b425948fcaac41fab2320cab SHA-256: 1e9e5ad6490155bd96283039a9eaf9aed163f2309a2e9a03f34789ade4ce21cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly imply an attempt to redirect users to malicious sites.

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 https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rdd8qpm87m3k6g24ff67pb058j/17077094122.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8a08d54d---xukus.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/1af97901f3d09d176b6235c07f9ceab6/wuforilikozowejedinej.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/28aivofafolu1f6asmasf1d7q5/kugimapojigileg.pdfIn PDF document text
    • https://ienter.bg/files/82116838726.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/20080748485.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24cdbfd24837d71151e6981492286456/95001158780.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/fopariwokuloron.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/98648591135.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/96033197119.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/garijitutuvuwa.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/sedomekojegum.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/faafb99fd1733de91fb67ba4bc8d6495/lusamidewi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/92715184548.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a144e8e0776---97044473563.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/6875039287.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/wiwilivewono.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/denekulavaroxamir.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d2e6cc2fb---tunufapebanujebonexuzi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da39781563---jaxowosokega.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/18771109295.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/zufemefovuzelusuwijimeg.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/32183419667.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/10144299098.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/6nui5hd3jqbugbn1giplp6lecb/63863048956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+apostrophe+for+possessionPDF 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_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 17876 bytes
SHA-256: 34e50176595b45af663775fb04daacf1c68a0f4ce6dd7fecfcb3066909a97e29
font_01_sfnt_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 10404 bytes
SHA-256: 61fd6979bcbd3e92a7b27b4295171ec558748f6a3c3585186320e018e00aa86c
font_02_sfnt_off0001306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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