Malicious PDF — malware analysis report

Static analysis result for SHA-256 58118e0da1be4abc…

MALICIOUS

PDF

89.4 KB Created: 2021-08-09 05:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59b73a92c626886e6977df23e5ce7512 SHA-1: 96489c0768961571b1dab54a88e4060bcca080ff SHA-256: 58118e0da1be4abc85f54fcb981606f7e8e5b1d93a0a80b09ce46f8fad06049a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=what+are+the+4+cardinal+virtues+and+their+meanings
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcec31a2c7---64488619877.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/87261d27d9f69e8fe82ae62ad5e68950/nikanojigufuwomolir.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c434d99b5---bejezatijibisipetorejuk.pdf
    • http://debseven.net/UserFiles/File/58478928524.pdf
    • http://cloverpark1959.com/clients/51168/File/fatudedimaxemawev.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/le5en07llc0hsheo221kr0gln2/viruwosofumamazogezo.pdf
    • http://grandviewgroupresort.com/upload/files/nufizorenaxetegugis.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1204349d---rodudovefexajugobosa.pdf
    • https://sona3elkhair.com/userfiles/file/sizugiromopaterav.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ba940ad15ba1924cb8a74e7695a80bf0/kuxinizodefumejivuvimi.pdf
    • https://pnp-studio.com/fckeditorfiles/file/nejemowokuwejujirelogikiz.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d105b0c9a---xowifudejerusokeromafub.pdf
    • http://muzeumostrowiec.pl/obrazy/file/nuzawofetunum.pdf
    • https://iohrp.org/f_files/files/papelofokobofanapazux.pdf
    • http://urduhadith.org/survey/userfiles/files/muvegojirewibixifijo.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b93f4156021239e15d7c60132c03d050/82069327217.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7a89bca7d4a3426706e5ec6e766d0722/20885036405.pdf
    • http://files.ibiza-ferien.de/file/29041134065.pdf
    • http://allasclub.com/campannas/file/lurisas.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b142d50cd40---4682409749.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vqqm9tnifnoefckfal879akbq3/marujokuwitewos.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ef06de65---94826303621.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb0a.bin
504d48333deeee5138859100898a8d4acaf7fa18adef9fe6be9ebef4393835ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 16800 bytes
font_01_sfnt_off0001267d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 16792 bytes
font_02_sfnt_off00013e94.bin
b8c049607823c96be48967797d54a141047b711182a4a2a191d255d12daaeb2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 10932 bytes