Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6caca68e476e2f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 02:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 402008ad0a71c3d5b5eb9e3688b041c5 SHA-1: a413370099665355006968f081bece4fd62023fc SHA-256: 4b6caca68e476e2f087d1da07aeb4abd49be80c5a9bd0a77ccbf827288409825
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://akanaymatbaa.com/calisma2/files/uploads/madowumilovuvolawov.pdf In PDF document text
    • http://russia-ex.com/images/blog/file/pulopikedonesovixobeb.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/186779f7c4ae64681678847b3779eda7/62739082107.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/46201705355.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109022110585264.pdfIn PDF document text
    • https://tekartltd.com/upload/files/60445774828.pdfIn PDF document text
    • https://x-software.cz/data/file/vumowuwado.pdfIn PDF document text
    • http://potya.com/49486328024.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/filivuvekejakolatenewa.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/xasabolotireveba.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f26924f77a4f18ed897892e64827b3aa/buromakinuxawirigibo.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jepulotojudemav.pdfIn PDF document text
    • http://cartopack.be/Images/file/denovanawej.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/tolinikigudipamika.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d509213c---gurezuzagepaxefopagesar.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xuzetag.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/81748075478.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/80821418334.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/61977822003.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/3570543947.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/14372401878.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/gowurujesudalurerisivudug.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rofupakapekegezonur.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/81650301371.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/14354252985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+know+who+stalks+me+on+instagramPDF 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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 17960 bytes
SHA-256: ee4e8955805869c39bcfa7196a94f389ff06f595a0320b35073285180eea3461
font_01_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 10724 bytes
SHA-256: fdbcacfa46fde1383c356fa64b493671fdd912a70803ec311f2a87289bc814fe
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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