Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43d0522c6d53f82…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 08:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe3a16287c7a539b97833ae7d57e890e SHA-1: f2d94833adf151d0237eb00def6b09782143df9c SHA-256: e43d0522c6d53f8216704aec814a0376bf82b2891e246ea970b50ea0ef8bbf0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating it functions as a link farm. The ClamAV detection and heuristic firings suggest this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4417

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=grammar+and+punctuation+correction+worksheets PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf24130d983.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/do8ch90l1dbtfkehfv9o7hadmt/xowik.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/vimawalekebi.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/fb85a68c94e3ceb7d8cb909b823157d3/detozamenupewuritoripe.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/16567733716.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/59e60454116a9a0a3a75f385834c4bd2/romupazekoxowodelumuxabe.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9d37vrbvncqlvd36vldqfd02n5/39450335876.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/meladagalutitifa.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16105836d7d61f---32840015848.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611574e43c224---nafonunuguzapo.pdfIn PDF document text
    • https://xigmatek.com/upload/files/26205936972.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072953b72bef---gozuragafovizod.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e501e538171---buririjek.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc3669213a---94370004052.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b309aa4638---disulodefifuraxowax.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dimezebowi.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/nolibidim.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zegapiwilut.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/16208054862.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/84aed25887ab4cb409d6e121923bf5e7/57679576049.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c486910e---78645679666.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a75c17aff---28367343163.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ed3a84d17---4207107535.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/jowoguromegaditoz.pdfIn PDF document text
    • https://argumentua.com/i/file/88264622502.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 17580 bytes
SHA-256: 20935b34e056a6bd2593f074cbc92c51da9b8c56137ad1602547825c577015a9
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 11048 bytes
SHA-256: 7bdfd1236c1ed12130f3334814ff8fb4ffb992df792a17c1516a75188c008efd

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