Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bb49bef1735133…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 07:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5df91dc0fc7c8d398b0a1cb74b0dc7d SHA-1: f7f50049d136aca00c3642da4c6c02d98e4a432e SHA-256: f2bb49bef1735133efe491562b1297635e1c32a9a60efbfc925e55a8c82a3ae4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to external sites. Several of these URLs point to compromised WordPress installations, indicating a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=breath+of+the+wild+iso+wii+u PDF link annotation
    • http://test-immo.com/file/ditonixesezokobefe.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/49292075557.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tiregofiranudet.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/sugodufagozawagerek.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/pokafogok.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/89154594249.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/rorafagepaxakusu.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/bojidu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d1cb3851c---lomosisuriputib.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/4330943132.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/nobetewiparane.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16147a45962feb---88394714763.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/gowofatugakowuzomovemoto.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/mavibob.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/rajogarinaledakupula.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/24357512081.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/lelavorufimuj.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rijuvuwujo.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/wimekojutajadejid.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/zubidew.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/nujotupijuk.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7a397664---55745143022.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/26764425385.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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 17900 bytes
SHA-256: 526364b3996f77ef6beb6e4c22de24088f4e2df6947f9d40a82b2b201d62f473
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 10588 bytes
SHA-256: f764c772b95f27bac041051540290e1a53801d3a1f7960305c8ecaebc459c79f