Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94a006a2eb35777…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 11:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b29c2a1a94321397888f07fd1535be1 SHA-1: 86213b5c9624556d9a0b1fca0862ec2d7739b43a SHA-256: a94a006a2eb35777ed9e2c10a9a584f686c923f66e45895988a2d35564eb1d81
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are identified as compromised CMS uploads or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or to direct users to phishing or malware-hosting sites. The document body is heavily obfuscated and does not provide clear textual content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://benhvienlaptop.biz/userfiles/file/xelivubik.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/724a44n8oci9mcpk660b96sie3/20001099212.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a164007973ee149d7dec1b28b240f328/9458372076.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/81380284363.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a1520d315fb---meniveki.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/94535830140.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16121a7b80d020---39736122073.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/81854452991.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/71296621136.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f5708375---palutorew.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/pimelomovu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/9400380984.pdfIn PDF document text
    • http://altus.pl/userfiles/file/najumematunateregojiv.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/pofijutonisoras.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/42268621908.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/vcj2cdoqtfkjljg5kdh4dmqo8b/zuxokoxutawevuxonudolel.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d487bd5d38---vivafupibixe.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160853fed6818b---6962239136.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9d3881a66d30b973d4b6a1d174769a17/pufufusafafelim.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/66991884850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=electrochemical+deburring+process+pdfPDF 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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 11288 bytes
SHA-256: 7c1f7620678d74ee6ef28415937691289892405265f226dd459a392e272a23c3
font_01_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 18424 bytes
SHA-256: 49ac46631eb89c49074a8e1b1e6196237e21405ddf157a5f7ad6a408fff845e8

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