Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b3b725edb58978…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 16:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 214e256f9857e132ca2ee343dd394a8e SHA-1: d68fa08a478f9ddd739e57266fed633e3b287ccb SHA-256: 88b3b725edb5897872b6408262a4d57377e0e9ce6ef70b42d2088b83eccd8173
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a primary function of redirecting users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=baixar+livro+corte+de+espinhos+e+rosas+pdf PDF link annotation
    • http://mytmbc.org/fckimage/file/44648463552.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/lefidinegilud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbd598362---77228743533.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/xedoranozagepakowotovazim.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/61161175821.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dee7f127f82---19153544529.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/jirerubejokumuluxupakif.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/rojasujumaxovo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853c5d5ce---90457340133.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8525f986d1e89ed9553c397b7b8a7fc5/kogofa.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/58694081013.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/86625791499.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae052d4a4---42075934992.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/musuxesezelomava.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/81762783806.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k5pmjea6ps2du4j0mk3fb2j3u9/93234470835.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/rewofewurika.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/45896889454.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/55e5381bdb33d4fca15fa5298c40d21c/12556831157.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1a58a3e5---16359416155.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc8d843e07---giwufepageburolamis.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d623b1741c5---ronibana.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c3c5deda1e6244a0d4b26a6535bb3902/dajaxuwogefafazibefeses.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/58ed9d1af197c4e83bf8d8ba2db7d0cb/bofab.pdfIn PDF document text
    • 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_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 19412 bytes
SHA-256: f069ab551c83b39f4f7ba02fe64a216246513ef29e59ca9eb7dbb9ef4dc3fddd
font_01_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 10936 bytes
SHA-256: e3795e66934446e098af3ae6fe1c28a2e8a14c3f88ab2fafe13d7c9078c76eb6
font_02_sfnt_off00013b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1