Malicious PDF — malware analysis report

Static analysis result for SHA-256 32208b388512310f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 11:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c9d377042523d6c126c8d5db3ba2d5b SHA-1: 570e20e663459ece8593c1347a07f35452b964a8 SHA-256: 32208b388512310fe775548c598e87983e679c970ba0393cb4549c8cc81733e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites 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 phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://synfarm.com/upload/files/79115858804.pdf In PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_66018E2605FB2F1D.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/93924543923.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/bujusan.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47db20513---sabepixelofofudobebirox.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/36165260721.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/8896940710.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/taniserilexejo.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/79427900404.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb3ea9730---monepelawovute.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d983d597a---zaselenukotetuxol.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f7b3232a38b4d8c6add301875877edbf/77862908432.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/83031690879.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/nekulofakegunuji.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4454460b---31598769415.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/83237536570.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/1237999260.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laxifabedevan.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kiposa.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/66182260807.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/josopabekalikuxabasube.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7cb19363b---bajor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+share+apps+through+bluetoothPDF 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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 18392 bytes
SHA-256: 5ed98d14ef3900dfabf2ea718893c41071cd1af08b9c95a70821759a31a1d0f8
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10884 bytes
SHA-256: 4b90ea78ce6b1a827538e0d9c275f434e2ecea9198d2eac3474475823e1fa8b2

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