Malicious PDF — malware analysis report

Static analysis result for SHA-256 83279412a5bb27a5…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 01:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6ddb18fc6be68c640e8629d668ef99f SHA-1: b098d9a545134dbcd7e27f74b4c2a328ef9b46e1 SHA-256: 83279412a5bb27a556730473509fed1064a37c9d1362db58aa14a9bd93e33fd3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mauspro.net/upload/files/94569619936.pdf In PDF document text
    • https://rolcsi-bau.hu/userfiles/files/31522873737.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940563d0588---65036098317.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fc119a40ddb9f1a1051d4ed083febd31/gaxanikizovetolase.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c091d82de---kivokorare.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/tibarokonekalafibisuku.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/79559600051.pdfIn PDF document text
    • http://szpk.hu/_user/file/maruvixexizu.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/85271215972.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ad920c68---jisivasilakafasaju.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607097396e578---50076074304.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/wivuso.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/22037906488.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3feb24443a---55684433249.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/vobatiginefikesimeni.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/99385032386.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/89597235829.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aced0ce45d4b5f74021448ee0316dda/56860420479.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210606191746.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/72731007095.pdfIn PDF document text
    • https://papiratisk.cz/soubory/xaguw.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051510513134.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bufslqtg64i4u0fekda0cpbipb/10171726009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=midwinter+of+the+spirit+episode+2PDF 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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 17848 bytes
SHA-256: 73e5a7d3fc28fa70d783d3fbfee39a3bb31ff7aa7903d050f0e45ca43a4c2589
font_01_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 10588 bytes
SHA-256: 3e2e2fc2a87c7619c49996bc557c2f68090bacd23efcaa30b1d8ef17541574ca

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