Malicious PDF — malware analysis report

Static analysis result for SHA-256 203d40138a8cd3fb…

MALICIOUS

PDF

82.4 KB Created: 2021-06-06 10:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 059931d628dbf03ee5fe263ecc30e312 SHA-1: 1d3ee882c653164d65b552ce35867aaa70013723 SHA-256: 203d40138a8cd3fb99a27bce99ed20b265828b736479f9a5e522be4cab14bdf5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=hacks+de+diamantes+para+free+fire+2019
    • http://mwflower.com/upimagesfile/%5C/56092638588.pdf
    • http://ngocvietbungalow.com/upload/files/89704753247.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a7377c77b66---xabofazupa.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6732ccc1---bafoke.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e8501acec---bivawat.pdf
    • http://silesiacapital.eu/data/file/lugesil.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/59d9254ed38d4798abc80f0df8f60597/wegirigawepavugav.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af79f66bb3---sivigutigajokewewivaloxiw.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/vukujovisavemizugu.pdf
    • https://aravlicraft.com/cmsCart//upload/file/33779307281.pdf
    • http://pantryscan.com/123cars/imagefck/file/31296446653.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe3779721---wuretulamigaz.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/r4f3rkv1l845l4bhjni454r8h0/74127104042.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff36e866b---13445300743.pdf
    • https://advance-pack.com/editor_upload/file/wugopujimeredesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d808.bin
008aea47049a549b9b67cb0043afea001b40ff90dd532a0da7b5767c39dba12e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 5776 bytes
font_01_sfnt_off0000eb95.bin
a0909e228fac4161b619fd7331abde8b30eee619dee5848611fd9b488a125109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 5060 bytes
font_02_sfnt_off0000fdfc.bin
af9a3f24e11bd96cba706e54b60721d110d37c18bece9d67eea9a9d6a3435a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 11420 bytes
font_03_sfnt_off0001237b.bin
0dc3d1ab5695a9283dd2460d2ca9be9d40b44f5b2ef0ab07f32c99eceeaf67b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 16620 bytes

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