Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50e2e68d91548b6…

MALICIOUS

PDF

103.7 KB Created: 2021-09-03 20:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4565a22cfb2fa55356b9be17912f82db SHA-1: 35283e2813a0ada75812c76ff7870669d07941d6 SHA-256: a50e2e68d91548b61f5cabcd44eb1b35f373ede1fa71aca328ae2bb7ffccc82a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and the ML classifier assigned a high probability of maliciousness. Several heuristics indicate the PDF is a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://congnghieptauthuyvietnam.vn/upload/files/nofadaka.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1c71705ea---bajepobiwe.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/61185205647.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/49246501173.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/xololemobuzewilapesajuf.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/doxunene.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/62a8d6da42d5d391805d14620118c2bc/4280998753.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/tudidakatupovumem.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/xorajupotebuvite.pdfIn PDF document text
    • http://alcantara.cz/data/file/revafejatiweworonebalo.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/73742230347.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c98ba2426---donajiraxobe.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725d3f611d6---68547899408.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/namuvilikazadoze.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/77068171588.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fab19df2c55d1633e2f1b48c4095d52c/fupivedino.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dp52abmo2nl4ark901tokqtvh2/bigatanus.pdfIn PDF document text
    • https://atl-50.com/files/file/nojupolutasozamexudilufim.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/gobufalapu.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/pobisuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6244ae4f17---gevizimasojewowa.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/12886790591.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/sodorafusej.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a23cddb9---gixotikaxobafape.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1q377c4sk58ii1afoe0b2hvni1/95397102168.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607527801a63d---tonopapojegudomisipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=psychological+evaluations+for+the+courts+4th+edition+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_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001460b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460B 18272 bytes
SHA-256: 5605d9900ff883da6fda8659350ccefdf7ee5c40ea706495cfa495de64d1b723
font_02_sfnt_off000175b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B6 11260 bytes
SHA-256: 85c83613b532131657d71528c6f3ff65e887f8ce7e0ef44ba1803151aad6011d

Open this report in the interactive analyzer, or submit your own file for analysis.