Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb398f98b113700…

MALICIOUS

PDF

90.3 KB Created: 2021-08-13 03:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52e67385ca399e04b37ef77451eb361e SHA-1: 7e58807b86fa482d5e24624e4187bd11f0254606 SHA-256: 5cb398f98b1137004563d92e069a8b3fd03e67edf450f7aff512c043edeb4b51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan. While no scripts were directly extracted, the nature of the links and the heuristic firings point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90043f5b4---96819767358.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a55496de---68834817230.pdfIn PDF document text
    • https://adikkedua.com/contents//files/56580264881.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2jmctrj0bel8arbl4oj8r7ahr9/50440951956.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/parotuwudibosenojalojovo.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/fafigefemuzu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pjesd4158l87vda5c67n38v5l3/ginofidika.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/98f7218e328cb2b105299ee73ce52a2a/gemunapomasegikol.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/16326749989.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/xipaw.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a4d86f07---77723689587.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/nometunabebisemewifidaxip.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/24815446755.pdfIn PDF document text
    • http://rhondachem.com/d/files/63294677667.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608559553cb8e---87706994700.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609c142c22b62---87783310515.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd7e618d8---26768007669.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/32375834628.pdfIn PDF document text
    • http://anm-av.de/uploads/files/87384335035.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tm8r5ttf1pu4o138tpij2821vf/82440452431.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/76940891821.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b23b349d1---joxumen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+a+broken+life+line+on+my+palm+meanPDF 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_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 16696 bytes
SHA-256: a52c520d99b1c095f88958d3b1c2ecb74dac8d582be36f3a9373246d249cdd32
font_02_sfnt_off000141bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BB 11104 bytes
SHA-256: 4016f86dfd5c00e8fb5db09abd7038c554af8156c6f8e43c5ba32762471fc179

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