Malicious PDF — malware analysis report

Static analysis result for SHA-256 5099d688fe0c7cdb…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 12:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e56fbf55fc45ef700dfca6846278dbe SHA-1: 8e886a00e440e4b23bbee9dbe03539d25eabaf12 SHA-256: 5099d688fe0c7cdb8cb8a7defc207371ef05b02057d9fc477557669c08868692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c8c00a30---12433610581.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/43647051992.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/nananifakobavabuwol.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160af97dd6b1eb---lotiwam.pdf
    • https://advik.net/userfiles/file/posejadikanubibikama.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd0c5150e---57548818248.pdf
    • http://blbr365.com/userfiles/file/1622302234.pdf
    • http://aire-limpio.com/img/editor/file/72762423899.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9d1d9f848acbd3fc1aabf5380d346403/xadunedid.pdf
    • https://dm288.com/slicice/file/dedejokesijodil.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c14497f75924c7cf6f61cb50a7fc0dd1/83514375259.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/43590178698.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a0188af91c861a26f98ae839eb9eb0a5/2979161033.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fc9eb2f4df2c04773ec09c1bdb329e2b/18251934555.pdf
    • http://archerelectricsupply.com/userfiles/file/dukikuraloluviro.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077143243727---14176214806.pdf
    • https://cottingham-group.com/cufiles/files/sozuloginubo.pdf
    • http://www.gesas.it/media/mailinglist/file/worom.pdf
    • https://mangmalungtea.com/userfiles/file/86312338268.pdf
    • http://csc0535.com/userfiles/file/20210703084240_2h9i2j.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ea9bdcc6---zizejixasi.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609696b45626b---6809700927.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=most+dangerous+kung+fu+style
    • 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_off0000ec49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 16792 bytes
font_01_sfnt_off00010460.bin
9f110e33adbc885c66c19bb5e274c898ade9ad2e81e0eb5da2c1e152987c699a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 10736 bytes
font_02_sfnt_off00011d0b.bin
fe13ff06480dbabbbd81bcb2b29d185d98752a0901937d4e88203fb83c72b5f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 16448 bytes