Malicious PDF — malware analysis report

Static analysis result for SHA-256 3493076a44dc3a34…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 21:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a0576e3ca3183ad2bc57a25810177a0 SHA-1: e7859da6f0d7f1ab519a9f4d7a8f8cce11702d54 SHA-256: 3493076a44dc3a346a5857813d235d5d75a7f760ff08914ef02c459a520c7203
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some links point to compromised CMS upload directories or disposable hosting, suggesting a malicious intent to lure users to potentially harmful sites. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://synowka.pl/galeria/file/47174792160.pdf In PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/fudelumasigagifabadodet.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/19077949638.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/44766179094.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/kedopi.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/tarajuvud.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108182137406385.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/liwebivegutilininopetuma.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/62302936381.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/93110662994.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u0vlckll070iqn01id7fgdp6le/zegagolatojugila.pdfIn PDF document text
    • https://purefeeling8.com/data/file/fulunuxiwuvox.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/wufivarujemavikosakego.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/paseliv.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/51335265870.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b5203aae805b6033171fe147017d5d1a/31540931802.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327507a2d8---duxedetejeragemosuwenes.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/718f433e97b34e05f39de25a81295132/zozoxubate.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/57306369627.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/wixukeretej.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zirefuxurakej.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5d54a70e---42242156615.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/73c0ac6b1a095f84ead2f00bab8246be/buzibemuximew.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d52ed33252---36760435121.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/61558315611.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/39f8b4ac539e0c4732083352562b563b/guwivojogoxun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=les+assertions+d%27audit+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_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 10536 bytes
SHA-256: b30b60c79afe22e10562d3586de161c16d10b24fc61dbb030b6c5604c5291181
font_02_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 19460 bytes
SHA-256: 8f9e9c7ccdab5b8b47255dcbbd58334dbc7129c01a1ade5d9f77a15365477fee