Malicious PDF — malware analysis report

Static analysis result for SHA-256 029cad5286bce6ff…

MALICIOUS

PDF

98.3 KB Created: 2021-07-24 06:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 375604ad12b164b8c286367b656dedcd SHA-1: fb619be4facb78aa8f290423e4d644a2db7d0cf7 SHA-256: 029cad5286bce6ff16e31829ceaa079aa92a81446350fb13b81c83bf1fecc75d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jingchengs.com/jingchengs/ckfinder/files/20210720092123.pdf In PDF document text
    • https://lescourailleurs.com/upload/editor/file/jogawitulivelamerejafifuw.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f6ed65d3---43531008424.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607811e3bffe6---feradisub.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/89130156458.pdfIn PDF document text
    • https://koratspring.com/upload/file/topesaguxupew.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7711d9721b---bigototejibixowaduvu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac32e3ade---88297928357.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af759787b---96462018267.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/a5qcto468sl0h5u5diak6h9050/58608990298.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/fefoxunekakufukulupabud.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/277f1e59ce09aedafa46655c4e2213a0/sufubajutepovemonaz.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/fe6181522f26243cd82cdbee2bfc7e12/tuxewowar.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083506305a36---welebiragepisikerunaduvig.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/beb4fbab440ef7a839ff99768b081d71/wezuzepazadifilowudowagoj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a15104bbdea---83050829485.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/25545614052.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/df0743c18ae50845d6406ba26350dc7f/3992306210.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tobarolilu.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5ff55d075acb26f2d82f6bf1a9b7bfc4/ravivuzorofakoxuwizexo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/omo3r9ja2tpsc54cm24unk8kce/nelirefenetaba.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/bifogiwe.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/bijofinasupazojikiwa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a36a2272---58619691954.pdfIn PDF document text
    • http://jkohut.pl/file/lorubatajinorowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+lazarus+project+aleksandar+hemon+pdfPDF 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_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 11136 bytes
SHA-256: 4a772d238f34558e94332be51a74eff6ae42631871116ed1b5e02ec860aa83ef
font_01_sfnt_off000132d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D5 18352 bytes
SHA-256: c56869af0e5d00d9688c9cd943a368373c609c2c54add8eb1aa04ea5078275ac
font_02_sfnt_off0001624b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1624B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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