Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c05355f624b63a5…

MALICIOUS

PDF

86.8 KB Created: 2021-08-23 17:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c99cdaad600c079005174b8285655b62 SHA-1: aa7277087906bc1c7d248e455f22e97039360cc8 SHA-256: 8c05355f624b63a5ffb0914f381789db5da6fb86c15a7cffdf1b6c44d8b96373
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://garglob.ru/uplcv?utm_term=spanish+word+for+lizard
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df341bf064---govudezegux.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160963ab647efc---satibi.pdf
    • http://gsprojekt.eu/userfiles/files/10785323507.pdf
    • http://promador.pl/userfiles/file/kuvafagotil.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8f6385ea578b032916b21cf42aceeb61/zovilobaxuzu.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d2c0a042018954a4589adb13b55415ac/93233746980.pdf
    • https://mimpishiodua.com/contents//files/43660484350.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b29902224---fegozagozifaw.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a78fab680e7db2b047083a20b9b69849/19350190467.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/29c8856915d5cabeab994c50cdbb4af0/zepifujenazefumu.pdf
    • https://langumeistras.lt/i/File/temagajomufuwigiluregeras.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d6b06416---sixewijedire.pdf
    • http://gibisch.org/files/files/gafojukumonajuneni.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5d2akcfo3hlaav398jrnsl9nnr/pafazow.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608183959ac04---3476085612.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d70cb6813a---bifima.pdf
    • https://aduanaldelvalle.com/userfiles/file/fuzafubab.pdf
    • http://kurier48.pl/files/userfiles/file/80950198672.pdf
    • http://singer-island-condos.com/userfiles/files/1006442263.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e719d2388a612a84268178eaf9017a0d/kipukakewijox.pdf
    • http://weingut-suppan.at/files/56102914452.pdf
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/50676811403.pdf
    • http://strahovka66.ru/userfiles/file/77095237504.pdf
    • http://chickenwild.com/upload/contents/images/images/zisanatume.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_off0000efa7.bin
258cbf1775e113cc77848b8e8574d41c5330ee30625f2b59204d846e4b8fa046
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 17200 bytes
font_01_sfnt_off00011c94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16792 bytes
font_02_sfnt_off000134ab.bin
3b1de3f5e065dbccf87e959c18888d5a7380d6f47b3b4a6c5a6866c57a5c8d57
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 10588 bytes