Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcb8e86bb9384b4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 05:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b2791f0883f0430dad9733e00a223bb SHA-1: 63e4696d0a323ada13a57d49f2553b64a1807d0b SHA-256: 2bcb8e86bb9384b4c44298d13170c668226983ce7326682fd9a6e2fd21d6667b
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The presence of an IP address literal in one of the URIs further increases suspicion. The primary attack pattern appears to be directing users to other malicious resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776c242cc26---sezusajaw.pdf
    • http://pobierzplik.pl/uploads/files/22386898987.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/917a65fc3e58b10957a1177d2e1ccaa1/wupazinu.pdf
    • http://autowassenindex.nl/images/uploads/4165291933.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/97a7dead7d6c34b0c864fa3d3ad62e16/94852260351.pdf
    • http://qca.ch/userfiles/file/pagezedesajulesubukib.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f489799ae---jobuf.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/r0cv60stihsokqegs621olr1ph/84962760539.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/83165a78771c8abf6670dfd21d31ad98/botuvoxi.pdf
    • http://naphotelbangkok.com/userfiles/files/67170352566.pdf
    • http://enidental.com/userfiles/file/20210807052205.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2d7e79aafa6c9befa2997abe5bb1492f/26080547623.pdf
    • https://ijp2.com/contents//files/714254215.pdf
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/24703264926.pdf
    • http://chouchouphuquoc.net/upload/ck/files/32719561146.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/491525211.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff5500e7c7---78824397594.pdf
    • http://tubietelbar.hu/uploadfile/18152190754.pdf
    • http://adria-ex.com/zotulakodog.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9fbe2b19a---783746511.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1d842102---finib.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608093c440231---96446130713.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd0a04dae---32219452272.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4ada864ad25a9018f4928645d86a75b7/59000119132.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jasperreport+java+example+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3d3.bin
c857f260fe011285484ec3bc7256ebf5951316e81e64cac4c6d1a3bb7f22523f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D3 10752 bytes
font_01_sfnt_off0000dcac.bin
1c2dbe6e4789941125541bd8fb1812b36ca6dc8616ce118b916bc12e6247ee9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 15924 bytes
font_02_sfnt_off0001059d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 16792 bytes