Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e7f408b7c52e51…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 21:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a31ce97a75c879bd0e16167623aa278 SHA-1: 5439420f46a1ec853d360dac655ad52f5f780f0e SHA-256: 99e7f408b7c52e511e8f3afd9d17be7f9d5c4c9f8fd038d78bbde033e3206c62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination. The presence of multiple unknown URLs suggests a broad distribution or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1646143c4d7d3eb2844647efe107eb41/26507833229.pdf In PDF document text
    • http://gysanya.com/upload/file/210909173758633722oscv25ozmrdb.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/81003215272.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/tewofuvirosomuv.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/28314016645.pdfIn PDF document text
    • http://healthywithhart.com/res/file/61524818135.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/vuleximisapowomofotak.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/83427757983.pdfIn PDF document text
    • https://pecsikult.hu/files/file/ribupugonotosap.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614255365f88a---norusinojodijajigejeve.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/fimup.pdfIn PDF document text
    • http://online-cycling.com/files/file/dezid.pdfIn PDF document text
    • http://sivam.pl/files/file/zamuvubazububu.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/nilativanuxipapotumolev.pdfIn PDF document text
    • http://dytac.hk/userfiles/32068030060.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/39519842091.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/98101044860.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/280891152.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/18413817644.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/ladirizonuwe.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0fe7e88a54db210c935cc90a207d4d3e/dibeja.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/17239911417.pdfIn PDF document text
    • http://coumert.com/images/file/tomakapesitimiderapeko.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191205812077.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/xutafapamun.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a6a0574db---burojuzetaboburup.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/53935564934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nba+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 18424 bytes
SHA-256: 37025194317b411a67ec7c802e5d8a0b9dcc83dff8bf2aebce09e8cd795d4502
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2C 10020 bytes
SHA-256: 44edb0ef2d69d11b3ef228502de63d597c42720cd551615b0495748f836b8694

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