Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e168f7089d71dba…

MALICIOUS

PDF

79.7 KB Created: 2021-10-07 10:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 97b2d219915c5dac4fe83f29c3c56be2 SHA-1: 43c735d4eaa1b47fc183f93cc30a122d92b0e729 SHA-256: 9e168f7089d71dba472de44a7bb7dd6b412e3736a5e1003514733459e31f0412
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS upload directories. The document body is unreadable, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/lapiwawituji.pdf In PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210904_8C1259DFE47DAB25.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/51240406401.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/goxaruwafatakixefokimofa.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/mesolobedigeduturub.pdfIn PDF document text
    • http://bionazorat.uznature.uz/userfiles/file/tufuxojutab.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/lumajegotafevatubirixe.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210927051352.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/71590136648.pdfIn PDF document text
    • http://rayanchem.com/d/files/72515154249.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615420f492f3d---bilokanuzan.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nasukobumabomenalu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/90250073550.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/gujanokarirut.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/bowesewulesukuzobupotufu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/bk6qmre8vcsst95fnevt8gmml2/68021113126.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/32917957433.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6f6f56a4f3898825e1cb667f44025e6c/81588388580.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/xataraf.pdfIn PDF document text
    • http://ceroki.com/image/files/ligarulozu.pdfIn PDF document text
    • https://suncables.co/images/file/dipanurobawefatusime.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/sexeviso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=art+history+infographicPDF 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_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 10676 bytes
SHA-256: 7af0e6c40cf6b1f2ced14b096900a2320948a513363f6a7bae852ffc652faa57
font_02_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 17980 bytes
SHA-256: 988b2252de1a97a4ea7a93ebf5a53e5a620892b3433d7f897db9928a90f4a718