Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c47a5c3a412c03…

MALICIOUS

PDF

91.2 KB Created: 2021-09-16 12:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9c9b95870af0f06f599599923cf9b0d SHA-1: db41a91afad82a68f3e73c30deb4c14e118b8728 SHA-256: 09c47a5c3a412c03dc67e93325ce3a0bdcea9c6f32b6ac053320e5dd286cbbb9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of numerous unknown URLs and the 'link farm' heuristic strongly suggest the document is designed to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ldksolar-officialliquidation.com/userfiles/files/vutotaligevemune.pdf
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/13739048238.pdf
    • https://indicaperu.com/userfiles/file/jagolu.pdf
    • http://lidaoxc.com/upload/files/71188327272.pdf
    • http://isotope3.pm-ural.com/uploads/files/gabemapiferaditavedos.pdf
    • http://metallpress.info/files/jurulerogamojaku.pdf
    • http://z-i-f.ru/userfiles/file/bewasefujunefagebo.pdf
    • http://klusjesindex.nl/images/uploads/bigizutakesobabamidazif.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d678bdc3d---19898853918.pdf
    • http://www.serenissimaservizi.com/files/92860928350.pdf
    • http://meimagedance.tw/ufiles/files/75157147360.pdf
    • http://areaengineeringsrl.eu/userfiles/files/31482424016.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4ff0083e3007b565539d4c75c992b326/zivajakugatakakinuko.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb0d946a8---regozera.pdf
    • http://zamgph.com/uploads/file/090528544706.pdf
    • https://mygrind.ie/userfiles/file/48303584718.pdf
    • http://oasis-inwaste.asia/files/file/58019200854.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/20656259902.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3f32b395---sewiluxujutigujik.pdf
    • https://oxi-dental.ro/imagini_ws/guratupawuxegenofubexo.pdf
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/29018119599.pdf
    • http://shyjjc.com/v15/Upload/file/2021910201379908.pdf
    • https://speedwayinfo.hu/uploads/file/sevozisakigevexa.pdf
    • http://jamalcar.com/userfiles/file/49661465669.pdf
    • http://www.sun-green.eu/ckfinder/userfiles/files/27867997988.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fast+and+furious+1+123movies
    • 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_off0000fb9b.bin
00c4bb2a9d9d56e22ff2293c18ade4f8e50195b93b079f2185211959ec38bb6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 18832 bytes
font_01_sfnt_off00012d5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 16792 bytes
font_02_sfnt_off00014571.bin
faa0d6a1476488d43f2dc1061153a95ce449dccf904f1bf9da5c7aeaecb480fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14571 10956 bytes