Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d92de9b7a2857b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 11:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84d14f5bd00a8d2cbf460039cecfca98 SHA-1: 1e5311424ed219e95bd4f62c26672a26780461be SHA-256: 43d92de9b7a2857b3af10efe8f5577060999421548b741e03762a35efc9373f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://erdivigado.hu/userkepek/file/34470304595.pdf In PDF document text
    • http://rubensova16.cz/files/file/vixodoxug.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210724233149.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/30725029637.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786251914c6---lifunevaponep.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839a69b7c31---24387221604.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/10f57a0841307126cfec34ff5eacb052/kimexoluvigox.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb669f1b3a---98262304511.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/5793fe7476e8b7e59d836601157c6578/51083328103.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/tigefanufufububudezijomaw.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fubukimuligoguwisifer.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/raxufodobafede.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/92352426346.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdfe580273---kiwozovu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/35539866590.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9e55dc0846ba473c2c148109c443f4aa/vixefaworuvabuf.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f51de6eb298---69620882778.pdfIn PDF document text
    • https://diphong.com/uploads/60879706752.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/gokadu.pdfIn PDF document text
    • https://landbar.com/upload/files/45725060520.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/2764275503.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/58456145771.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/90111221248.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/27734248676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=thinking+out+loud+pdf+piano+sheetPDF 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_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 10832 bytes
SHA-256: 348aaf9f9482942ef8d79088469ff20b231e1c34852dc5db5dc8a91b43acbf1b
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 18632 bytes
SHA-256: 665f9b9e3f844b5c924d4959f828df8234ad355fe2c137decc538e47778365a6
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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