Malicious PDF — malware analysis report

Static analysis result for SHA-256 9346db7524c0ddd9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 21:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28dafe87084089584f90472d65b07805 SHA-1: fc2b98b03d0574630d01d94e2147ee0314fe4adb SHA-256: 9346db7524c0ddd9567cc3e2fda6b83d7ce361053340827478f96d1c7fb51bfd
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e899d7529---60552702938.pdf
    • http://enricobarraco.com/files/xiwavafinawedemefuzida.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/98053158424.pdf
    • https://wecareprogram.org/images/file/50084186547.pdf
    • https://ecosolar-energy.com/piceditor/file/lopuxikipenirulubapu.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313845a543d---vonuxoxeli.pdf
    • http://mama-care.com/UserFiles/file/63409880850.pdf
    • http://gibisch.info/files/files/mifopavirifunib.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142901201ab1---33491090271.pdf
    • https://valstybestarnyba.com/upckfinder/files/kumimazoturewubegakebejuv.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/56280882387.pdf
    • http://techscreening.com/userfiles/files/tuposiditabuxidawulif.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/vulebetuwiridiloso.pdf
    • http://hueide.com/upload/files/49885811618.pdf
    • http://boldogelet.hu/media/75765289209.pdf
    • https://lostfoundglobal.com/userfiles/file/sevatijemepa.pdf
    • http://turbotechnik24.de/userfiles/file/bimil.pdf
    • https://mk-sito.it/uploads/file/96786337936.pdf
    • https://mimpishio2.com/contents/files/65288250793.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613542f8f3629---52926387747.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906135830556342.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149449d1fa93---14267634957.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/kewapivub.pdf
    • https://edgecs.com/documents/91000752220.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400e812f0a9---92577251046.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=clear+cache+on+your+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 16792 bytes
font_01_sfnt_off0000ca38.bin
0c804a88d613bf73027b1124723f1da80e2f06007611d4e17f58746f71b03c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 16048 bytes
font_02_sfnt_off0000f2ae.bin
d3b8dc48f1d18675ed79c2c8bd816e36d168c46ad7964da9abfcf693abd62cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 10360 bytes