Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8023c2d63bd143…

MALICIOUS

PDF

90.8 KB Created: 2021-08-27 21:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdb00fe898ad1f9153ec684845f75182 SHA-1: ceb4bc0f435c9cfb7bf7b7006d5f726fd0de39a8 SHA-256: 5f8023c2d63bd143aa329b11b9c6c1f8f71e9d398dc5cca16e5bec774f29903f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://swaminarayangm.org/userfiles/file/gumuzojizupiwojib.pdf In PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/26104940696.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/26830111251.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/fogawaliwipoda.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/lureziniwez.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/cbf3af678c277b11430e7dfeeeddba04/69869172407.pdfIn PDF document text
    • https://amblamy.ee/upload/file/tafidazosepoxovopovegobor.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/xulebisagituzu.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/lixizefoguxabojujutavire.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/xuguzi.pdfIn PDF document text
    • https://esvigo.com/upload/files/jojomixuzuved.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/mekavema.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58a708bd54---81808917855.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/lulilubosikedaroge.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d38d0619310---23926897343.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/20677078993.pdfIn PDF document text
    • https://unitjaya.com/contents//files/romiludumegeduzeguve.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6mag4vqvrg4so4ldprjcl3tar2/bifimalu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1q3emlqe5ofjcmint4k06jnvg1/kigimefit.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jofufixotunikebawanamam.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/19390261747.pdfIn PDF document text
    • https://csodamalom.hu/files/files/lalosodugabavebe.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/woxude.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/roferanavaminulikukik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=i+accidentally+ate+google+feud+answersPDF 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_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 18384 bytes
SHA-256: ad45c0d6d359e49f443238ac46c92ab0fc298b9b1b9cf12def891f855f67cae3
font_02_sfnt_off000143ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FF 10900 bytes
SHA-256: 05795015f4f3d3f5e098ca50575738e755baf633a502b0e1dfb9ceb2cc711e49