Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6d5f3cc59a98b3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 02:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67349dc95c69446302d28ded64235304 SHA-1: 81cd7ee9ecc13f4fbb6c08523e09440fff9a7021 SHA-256: 4d6d5f3cc59a98b39a94516d155a60caf0c1beec571b1d39be88519566c64cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://qualitygums.com/userfiles/file/78700746385.pdf In PDF document text
    • http://vncdata.net/app/webroot/uploads/files/55518792566.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/85548930284.pdfIn PDF document text
    • https://vientangluc.com/upload/files/1026806581.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/fixuduwanati.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6861c24a07a721c3d4e205e85d162c3e/nibepusudebutuj.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202196614501302.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/kijokedifigezetumulij.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/xipawamuju.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/vakijoxele.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/tevixakitiniweraxitemu.pdfIn PDF document text
    • https://andhimazhai.com/images/files/tetanugonanapuje.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/92916172293.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa2f6e104---85337085179.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136516c0cc29---93321473938.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/vajukitunubokixavilajazor.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/nibidatif.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/wazinagobujiwajaze.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/28421595569.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/86387823364.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/najimilifebazusufonop.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9724929b0a376bdffa631e8b1794cd8d/lujotijise.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210902_C108C0F497ACC2E7.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nulidusoxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=twitch+mod+apkPDF 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_off0000c4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 16140 bytes
SHA-256: 1c46d294deb2b67bb8f3b4b106ad5dd45bdac4983475219d92975ff67a67a6d6
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10372 bytes
SHA-256: 07eb0379be4046d07763ac026f06f843c16fe05afb569baa6d0e6b508a9b8bd3

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