Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbdece846221dc4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 04:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9278088b28bdfc56511e29125d97d9b SHA-1: 54c72688a92d4333ae89816b1234eefc88dc320c SHA-256: 3dbdece846221dc40622372ad3890b91523e09c1777b5daf547f9a77bb5c83f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified the file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/421ecd82c6169ad35be8aebdebcf2f50/puwapogovajowaz.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc720ceccd---narot.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/75357601871.pdfIn PDF document text
    • http://sinners-party.de/media/file/84984310220.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/84018713889.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/75009041282.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/59227593659.pdfIn PDF document text
    • http://ladna.pl/user_images/file/43676529124.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/86291063594.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/vupizoromexunedetukujez.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/japigobexipojoler.pdfIn PDF document text
    • http://ipublicity.cz/data/file/45055981171.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210926172507.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/gixinunekamikowisubana.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/fodibumusoruzeturoxolu.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210921_C95CA527EDAE3DF9.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xifivavefelisuti.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wibef.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bagudogalaxowuxifepeme.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614b53ce0b5e0---23670142534.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/vogotagirinawivozim.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/776095592.pdfIn PDF document text
    • https://coluer.ir/documents/file/xafupowokave.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/65959198681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=miss+teacher+full+movie+onlinePDF 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_off0000b1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 15316 bytes
SHA-256: 593f0a3f1fed4a5016314b5dcab1148c17d16153375c4046d43dff108a906df9
font_02_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 10760 bytes
SHA-256: d8bed6b699f9943549716bc06a6359f7f07ef149dbb16e4ad2f552f2ca1a9c3f