Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f41097fd9aea1d1…

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 04:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02725fdb2deaf3b2b520c60e343b3b82 SHA-1: d38ebe132133193617ba1d6969e45cf5f56e2e20 SHA-256: 1f41097fd9aea1d14559fc73fe309604f991df4cf417afbfa0cd631b579be0b1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm used to obscure the final destination. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5af5ea0ee---sanoxusujovesilulununemiw.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12a8f03cc---84423595549.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/jozazazitizijotu.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/naluguxasewosixajowujir.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ds8gq5rtclrcaqebhojpntqmvh/45629018820.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac60e78a112---fuxavo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8550847e5---luxofuras.pdfIn PDF document text
    • http://splogservice.ru/content/file/21314995096.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/8865387088.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/21339c027ff78cb6693ccf8049566096/52448595693.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/powolopakuvalexezorab.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/xamubiz.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a7045e8a91e0b7cd0d89519139d8d270/41372550980.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/padiwoxisarobovebon.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/42560344031.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/xapejebazire.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfcd5d84e338cff41f7029a9ab1d531d/ragolegi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607995be490d9---25945926657.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/vufezejaxel.pdfIn PDF document text
    • https://energooptima.hu/upload/File/3679670813.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/tipijiduwo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/eub7vfjsuo38hnaiq39u6do163/dudinazegaridag.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/25febe3eee5ca5aca16144d77e9c21ed/jawabaloxu.pdfIn PDF document text
    • http://rcot.by/pics/files/29178371157.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2ec194f7---kevegukuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=problemas+de+funciones+exponenciales+y+logaritmicas+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_off0000bdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 16960 bytes
SHA-256: 9ade9ae0da1acccaf45310aa91e2613fada41188504c867b512b4d5b2fcbc6c6
font_02_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 11420 bytes
SHA-256: b4afd23997461d77e2f62c58657f7234d6d417cd3c51e15f85850a0794c49306