Malicious PDF — malware analysis report

Static analysis result for SHA-256 45da4fe82e2cfe1b…

MALICIOUS

PDF

89.1 KB Created: 2021-05-10 11:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b42464ccdde4dcfad25da04b7b905a1 SHA-1: 7d217e3d85eef6c9b213e6c457a0285bfc9e5dde SHA-256: 45da4fe82e2cfe1b3e91078794d318ea352644be4e7fbabf27c7dce27602c0df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ncli97muiodvsghkt662esfmi6/38820719348.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ed81e94cd0f1eeb414a787e49298ad2b/44694812683.pdf
    • https://avenue102.com/uploads/file/fiwixodudemivufumuzoxa.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/goa2e0olnksgvfvg5lgr8bsb1o/46703351851.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452b7abe00---9342881108.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/aac8c0c164379ce484a802a572b77936/74720309471.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160941877239dc---73787541688.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/29952bc1e53fc70f5670280479f75f65/numabomamuleziwaj.pdf
    • http://aceonlinementors.com/userfiles/file/49130219180.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098768a46572---zumuruwipemutigibixugutit.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252147e052---33176907726.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d79bdf22b---52646675828.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7qoln9mg72d9d9rtabdqkc3jon/xisuniligonabovokosaf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac26c77eec---52537947963.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kvqu5t4bcj383mk04bkdmbn6nr/60747502168.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2muti2p2b0ec6q3evfgomlf1c4/betir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=abstract+art+images
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114c4.bin
6d7f3d12fa16fbf1d6331bb82fdbfabce1fb31a7c0b2db3ed3ade27fb0503955
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 4788 bytes
font_01_sfnt_off00012501.bin
cfbe87c832b9cc3d4c7606b3c350e8cae91f1b64ce804aece7dde95812e5173e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 10816 bytes
font_02_sfnt_off00014951.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14951 4324 bytes