Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6058b8890ac048…

MALICIOUS

PDF

103.4 KB Created: 2021-06-28 15:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e3aec837e2bf17a4ea1dd024bb2bd31 SHA-1: b27f33fb62fbd85fe2b93d749e7c544994911e74 SHA-256: bf6058b8890ac048a27c5fb678e2ee0a5baf6a1f478a8d925aece5bdaf05b6bd
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic PDF_RANDOM_URL_LINK specifically points to a PDF hosted on a suspicious domain, suggesting a malicious intent to redirect users. While no scripts were directly extracted, the nature of the links and the ML classification indicate a high likelihood of this document being used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=fit+yene+meaning+in+english
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tlnjo7999v2ugpbuhjknnpf8im/jugazujuminavif.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2c6bf6627c5e956bde880b1f4b6e3b4b/16739839592.pdf
    • https://chinese-wall.tw/upload/files/zufokajuxuru.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f816e297d8ceace66065421aad9085e6/gojodupevedipu.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094277ad6e47---95844702210.pdf
    • http://poorclarescork.ie/images/gawebil.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/nimetonotuxudurex.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988e6063727---fufotamapafuza.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3r1mn6d96fjh71c97nofhut4kj/93808008331.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa190eb81b6---10933519046.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1682a1e2ac---89779891372.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210602_EAFFF0EC24991329.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae9882a4b0---demefabefik.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607041e5e8d8e---92698510396.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d74e29f7c85e06107dc5c8bc7cc561c9/xapuwofevujeri.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d6f373f79---84227852400.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2808d97c---73300370325.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a930f26b97a---5759955372.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e091e5711c---kovezonunapagux.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qqin4ofq76lpn7pn6t8fpbnu02/98575471184.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff08b31af---35216901653.pdf
    • https://autotrans911.com/thread/admin/uploads/file/36836152794.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/du9bt2nunos7t3mqkbkh7016od/38112745045.pdf
    • https://betenagro.com/sites/default/files/file/67191376477.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb9d49f78---fujewazosufeterufuredi.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609212ca27dfe---3780090154.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015ad2.bin
f9ef1843dee738b0ab9fc5966ac136f3ff0bb28abbeae55251d9f85643172b20		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15AD2 17532 bytes
font_00_sfnt_off00010ec3.bin
0c6fc01ac9d8cc8334282992a386d9de01e7a9275612a5fff802c5d68585adf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 20460 bytes
font_01_sfnt_off0001436e.bin
d32c21b17e59dca9151487dcfe3a25e7795ccf73054c9d2ff873a26550821337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1436E 10428 bytes
font_03_sfnt_off00017514.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17514 16792 bytes

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