Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d01ba1c37b1404…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 07:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e92a02798b82412da6f33d9f35b30c9a SHA-1: 24c24d49cd861132b914d40ad96032942af75fab SHA-256: 37d01ba1c37b1404e15054f3f6ca386ef36c955a1f5cc9686657ac17ed692078
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/dcc8ad2195d9cab491f144562c4b7c99/62653770508.pdf In PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/lusodubegeberotanoposo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c15c6935---82769798976.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/sidivivazawibuf.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/53167276626.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/96740228744.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/fujefawizi.pdfIn PDF document text
    • http://bdnchem.com/upload/files/zuvunoteporarulekakap.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/nisamevizuwefomaki.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a69e32ca41---ridopifavexomizulepiz.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/4487098557.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a704e10e08f---tudugowoxaburix.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/84653882674.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160854eafdc212---tirakegizudisoniberaweno.pdfIn PDF document text
    • http://farashimirooz.com/files/61245121969.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/nuxesebufokebu.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/pivovoxovotam.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/josom.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/61505914605.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/59233370522.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/94955037884.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/viwasugini.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2ae3ee9e021ba98cd7d8e49e625625b1/zomewu.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/zowabubiwisuduretani.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pegidinexeber.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160701c3e39cac---96382245768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hrc+meaning+in+hardnessPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 17428 bytes
SHA-256: 8adbf504777fed6e61caab49e4a0731f05ce9d657780c9190fb391ae1fafa8a6
font_02_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 10544 bytes
SHA-256: 8f73efb3e1e7dd6fb8a67f64d5ecac6c46f48d0e2b666dfbb2bb96af83919719

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