Malicious PDF — malware analysis report

Static analysis result for SHA-256 5887fc082b50b6ff…

MALICIOUS

PDF

74.3 KB Created: 2021-07-10 10:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6147ca988d24093c3e6c14ecdc29353c SHA-1: d4d3b9bfb67a49ecacf2c16927327bbcc66edbf5 SHA-256: 5887fc082b50b6ff2df02a4ac3327245763862ed5c5a4463735c251fc5d0492a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. These links likely lead to malicious content or phishing pages, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://allytemp.ru/uplcv?utm_term=phipps+plaza+stores
    • https://himalayanthailand.com/image/upload/File/bepikexivip.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7j9qjv8fb8k7s1u8inbfo22l2t/67472605158.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/qotal44egm689roklal1t85g6t/xuzul.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/iq4imgeiojh7thimn45abfs4rp/28696321507.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5379d5c6535a10332a578c489ea5b6f2/migidija.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a217f6c77ca---72498390687.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d84b833abe1---tuvimag.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2f691eb8040e4e82da7d79cddc93eee2/wejifowidogumovirakip.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/93773242955.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ff5493d9f---58204922832.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22595567e1---14899458480.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160782ce9f2530---23511211739.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47a3b9d0c---64415232713.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5d4d3606---86428585693.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3a5a04b8---46061181947.pdf
    • http://benetalent.com/upload/files/81907702902.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b93b9cc77---redigiwuvatefefoxu.pdf
    • http://dent-pro.cz/pic/file/dosed.pdf
    • http://littlepearlbooks.in/data/eimages/file/kiwaxe.pdf
    • https://tortugafilms.ca/adminfiles/file/68532859456.pdf
    • https://wagaskar.com/media/datowezimugixek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b574f1b5583---parabatatodejowaluj.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b033c043a6d---11849473204.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0c9.bin
ffb8fa328a53180adb20a953d86353c7032374f9ce169ecaf84760380b4870a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C9 16944 bytes
font_01_sfnt_off0000ecb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 16792 bytes
font_02_sfnt_off000104cd.bin
64f565ce9f0c2307688ae9df6bfe34c98b8020bd6ba9b8029b93c187d1999dbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10308 bytes