Malicious PDF — malware analysis report

Static analysis result for SHA-256 f086a13c2d6ef9c4…

MALICIOUS

PDF

80.7 KB Created: 2021-10-05 00:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bfdbccd4d4e201a5580ce7810015802 SHA-1: c276e187d835fc5339682fca44e80211f66fbb6f SHA-256: f086a13c2d6ef9c4968168e2bd44f764124ecbc7faabb3e884dcdd3982f7ea65
204 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating embedded JavaScript and links to algorithmically-generated URLs. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document is part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noglehoma.com/ckeditor/files/files/disarirevemi.pdf
    • https://vietcuongcorp.com/uploads/news/files/lubibalalebijegade.pdf
    • http://e-park.es/img/uploads/files/fovivasodisa.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/bafepijix.pdf
    • https://datatalk.ilvzhou.com/upload/files/2021/10/202110011838058750.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/79116763832.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda47c120c---71313753843.pdf
    • http://trips-in.com/ckupload/files/46384726477.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/99199052319.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a4pqa94ovs6g6joj39cmkiqo96/mesan.pdf
    • http://agisinfo.ru/uploads/content/files/kosigagibe.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/54070337930.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613897902eba6---xezasawizakewevoxu.pdf
    • http://imoroz.by/upload/file/silekatajafogajo.pdf
    • https://cantellodetersiviprofessionali.it/uploads/file/18121697489.pdf
    • https://golf-tout-terrain.com/publish/page/file/xekogodiwejesekoluwusox.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/71318551554.pdf
    • https://justforjetscatering.com/userfiles/image/files/jixoti.pdf
    • http://selfmadefilms.nl/userfiles/files/zitokiwuxujojalirubun.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/gabanefizozivixupesulifum.pdf
    • https://jobtiara.com/files/files/damepesigumulogovavawinu.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/95869488422.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/17030587728.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/55425eccd032aa7df519fd0b1f05ef5b/9474818819.pdf
    • http://srtprogetti.eu/userfiles/files/difaxelivekizobedo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=row+and+column+in+python
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d658.bin
5b9987ab00cbc4598f781de852037c1e1d7398b0ff9fc0f7049a0ed67586aeb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10724 bytes
font_01_sfnt_off0000eed0.bin
29429334ac515a193ad682dc76499af52ba108b328664ac1cf93e205821d6da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 17644 bytes
font_02_sfnt_off00011cf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes

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