Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba158419af03570b…

MALICIOUS

PDF

83.2 KB Created: 2021-07-26 18:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 530049ed737f897d91dac6ce863b7600 SHA-1: 8def96071e4b4e77867b6318da15675f96054204 SHA-256: ba158419af03570b34c0d6c2e3a7295063df93e4971a52e8339be2ce9f5c3c40
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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://reikihaus.com/clients/75291/File/zakekovatidibamabujuxuxim.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/lepodobeverekerekemu.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/78910523649.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bbe6ff0a1670d9c5fe94a98e150b762b/72937383816.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d776b356869---46222392047.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/10957266140.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/29345882783.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094152b6e02c---85969299832.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/85684168489.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67536817604.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/mopesodokufawab.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/69339768124.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210521213054.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4f62bd8093f5d34176ffab6f6690405b/rijowiwasuteberemipebu.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/zaxitumapilataduba.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/72752142728.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160777af219d34---raremabigogaxafibu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lugubigozir.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/nelejaxifu.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/37052411dabac26a63d3eb39cb2ccfd9/38575086251.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/ruvojejemumaroriruxemupa.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e599886206---23434235514.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e0f15359---repevoziwiso.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/konetusazijixawigoragox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=blockman+go+mod+apk+unlimited+money+%26+gcubes+an1.comIn PDF document text
    • 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 10948 bytes
SHA-256: 0f29ef1207dbcb0b59d88151a518d4c5b70d44ae699b8c3c4b8b5d5b0a58c652
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 17404 bytes
SHA-256: c601d5a69b858519db06129d97080095c6fab8cc88e5bbbaac9694256de243a4
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1