Malicious PDF — malware analysis report

Static analysis result for SHA-256 151c91de5e62bb89…

MALICIOUS

PDF

82.9 KB Created: 2021-06-27 20:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be43ae93b40fcec799eb679e4df5b657 SHA-1: 7416d71753625d71eb15ed089fcd1f0b94ab94e5 SHA-256: 151c91de5e62bb89980e6ec71d857d03d41ee3ff5bc83a0a3832d82d1c58a75b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, including WordPress upload directories. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/64892998637.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072004a806b9---vuvomojufidazamosut.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/o2lik0lbdqvbp7aeov16noke37/muxifunapop.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/76243e777da963c1fd96506796ad4612/turuzenisijolire.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f045f2be---83571929124.pdf
    • https://adepotcustom.com/UploadFiles/file/20210508153231141.pdf
    • http://bycongroup.com/UserFiles/file/90305776105.pdf
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/77970743241.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ba052a85---37498355528.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fdedf9915b740a8a8faa970b499cb2fa/mikanev.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a0be9a2485ae525255d26912d8c39719/tuwunukewepa.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1586514b---metajewafakipalilixur.pdf
    • https://m-isc.com/userfiles/file/govalulebutuk.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a3a7c7386bc7720255ba5aabdf3948a9/ledafimoditoma.pdf
    • https://gbagencement.fr/uploads/file/siwibujirakesez.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078245d2f75a---vitudefu.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/2cc3175446a1e86a567d70660d3e05c1/99018036986.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d061012bcfc---zoxadebilowuduzivop.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/99995486160.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210609_16AF8A4F6761B0CD.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f250d08455---20893301991.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/39c663d5f82ff1a4cdd33d5c20180979/nafozawizomul.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1ea1a4bf5896751897d42942861878c3/53977747285.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3q427fe05f1ejj6995cn6o0rfe/mosakefoxazeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dependent+variable+group
    • 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_off0000e265.bin
6541ed174b08e5529bc3bee13e7553f8efc875880863bb70410da2b89a367f53
pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 16848 bytes
font_01_sfnt_off00010e31.bin
f60c810799944395f7bb38676165bbc588a9166200d58d5cd22f3d6d3e9d4d07
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 10704 bytes
font_02_sfnt_off0001266d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 16792 bytes