Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2580f8f197c600c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 12:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7084a49fbd44a258e2a931e3273b77d0 SHA-1: bca6659906506f882532502cd2438017e9a4593c SHA-256: b2580f8f197c600cd138f9106815e792e123fb10588caf03c871e1d406bba3bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to numerous other PDF files hosted on compromised websites, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true malicious destination through a network of disposable and compromised hosting. No scripts were extracted, but the overall structure suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/0ec61a920cc3a3fae8fc320ca3a4addc/56671731094.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133662aeaa1b---narisajidojaxujije.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vudirezudisozosipat.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/4598362451.pdfIn PDF document text
    • http://annabarons.lv/files/files/86270963861.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/86e612918831971540138f5fec4c7274/befudimikotanatokodu.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/kojomipasamegudipopumug.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/90151414151.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/83172377841.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/6033374036.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2649d4332---nuvote.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908055014105297.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/053fdf27fe49453777cba11f2d62f105/vomizenuwexu.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210909213802.pdfIn PDF document text
    • http://budka39.ru/files/zedovar.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/49099616082.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397adced48b---19865400466.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/juvujusixonogumod.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/48242820857.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/gigetonozuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chale+aana+audio+song+download+mp4PDF 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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 10936 bytes
SHA-256: 9799ce939f822f0bf19c011f04dceb0ca21ce2068faf526d34e69710ad61b160
font_01_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 15952 bytes
SHA-256: dd28cda5cbb96867bfadab45c1fd34d588c1c17c2e8679f1e77b8e6956303152
font_02_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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