Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaa49a5dca7b5cf…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 23:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12a3bce73f36f1ba6b03ecaceed987d2 SHA-1: c1e333de9a4b59460767993bd82dd0bae3cf3b59 SHA-256: fcaa49a5dca7b5cf057f0a36dc9dbed3c226968ed9912293a5513cc1a46f4280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3efa7beaf---rimusipamemezifolinovumi.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/14433919790.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c636c1b3f63---walomuri.pdfIn PDF document text
    • http://amdind.com/userfiles/file/4046030779.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/45019022614.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/jamepowofajenug.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/61274179261.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/60221033039.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t8quio4gkn2fj496ccdp27kino/59864508129.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/fivifunuveverevoxofakeb.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7ae070fdadc79fe322392022474be21b/63929837843.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d9ceaa138---86376292454.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/dojasot.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/mifevirawipisewamu.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/zuvalunuf.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/gidevebawakevo.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/89255824578.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/55298706778.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/59388652357.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/62455568900.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a24efa36ea8---13305428460.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/54133754320.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///gijabitugenufiluzutas.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160773806888d3---vadovixorukinavofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=incoterms+2019+peru+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_off0000be05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 16608 bytes
SHA-256: 3006e72e2f5dc26bcf21e4cb6330015ef17b654aa16061ef11b7ce1fdc5cfafe
font_01_sfnt_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 10992 bytes
SHA-256: 060ed3b256e4720aabafa1c48feb78cd87eec456008446dad97054212f12b66a
font_02_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1