Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24c54c78d59b471…

MALICIOUS

PDF

74.4 KB Created: 2021-09-24 20:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84a257182925a47a35d99cd6e6431dfa SHA-1: 9ae3970856ed6c25c4488e577e6a8a16e8803eaa SHA-256: c24c54c78d59b471e273bf2badbe3e6fba87834153573a902e078a846cdd983b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The URLs are designed to mimic software download links, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=free+download+microsoft+office+2010+64+bit+full+with+activation+key PDF link annotation
    • http://lynxauto.ru/userfiles/file/3607584919.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/disoralowola.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/43138962363.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/derijaxoto.pdfIn PDF document text
    • http://bamor.org/userfiles/file/ruzedixogur.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/58997160857.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/82627923276.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/zasuduraxewokowoxuvufu.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/bexagi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d97652bfc---wesevelilol.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/jawenisoginida.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/36429578104.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/61944194285.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/86543857263.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/wovemikiniwov.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/62e0888505d5301c11aaad205d62862c/ronekowosi.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/10590673971.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147045c2e08b---funukorosemumiwosewubej.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/55707458372.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/14568290486.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/benukovatelimababal.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/vizatomifonumifo.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/bipojaworizaronofa.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16142016ad3d04---18576542846.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/ranuloporega.pdfIn PDF document text
    • 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_off0000b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70D 11856 bytes
SHA-256: c0ea922d1fc705958c0dcb09484ad114df9212765fa02b679d7f1e0d574b76ac
font_01_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 17704 bytes
SHA-256: a0aab81b662b74d02eb62e27dea3b29443c993e9e285b764fe6c87c5310cec8d
font_02_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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