Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee7ef49307a2fcf…

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 00:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 412dc6eb2f6f6ea0f33a7bf426aa0d0b SHA-1: 244780192ba669f7fa0e10d332c2972e929494c9 SHA-256: aee7ef49307a2fcf64528e1d984cab26e3ee626a34025c7bfdbc77325d4ce62d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://hfbee.tw/upload/ckfinder_temp/files/20210925082212.pdf In PDF document text
    • http://onelove.cz/file/tepegitiw.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/76c92a43b6f75d17800833dc9ec7b234/nadexeba.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/48894840304.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a78286a50---lujasagijoga.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/zafujova.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/lemetoruvag.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/11278696278.pdfIn PDF document text
    • http://halmar.info/userfiles/file/52499187747.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8e494dd13e4667b7c2ae24d84c9d9fad/wiludoxezevu.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-27-05-21-14-66.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/69981923003.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/41213785177.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/45739628791.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/gelurofiselofepuviram.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/19798239913.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/65521724510.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/febomijelilitan.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/13117669608.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614472278469e---5502321886.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/10623369308.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/gerodewixadasafigutowoba.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/70714334648.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614092d88ed90---zebezap.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/faduzigobipe.pdfIn PDF document text
    • http://sushi-belovo.ru/files/pewebog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+convert+video+to+mp3+on+android+phonePDF 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_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 10880 bytes
SHA-256: fdd3011fed94bc117ed645698dd2e25dc5a1686804b856d40fe6032dde10d6e2
font_01_sfnt_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 18164 bytes
SHA-256: 12b9886a3c34c66a24385f35e4a36205b64f38932f33bfa8832f5e8bdf735b81
font_02_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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