Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbd864387ddc2bc…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 02:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c6be7a26b6b0bda4c7b049b2c095c3c SHA-1: bf08af9ac21d0a5592f1f149b32cfcb91df1d72b SHA-256: cbbd864387ddc2bcf93ae5f5e11c2f3df84f3833a8cc7ceb93d8b3742cadce5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, identified as a link farm. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score indicates a malicious intent, likely to direct users to potentially harmful content or phishing sites. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://potya.com/zagegigezapufukeramexaf.pdf In PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/8e3b0a4456e3b3e7ad271092d0bfaff9.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/lejozijavusakinup.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109071019279593.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210926_184628.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/budakefolufadagige.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091415232630.pdfIn PDF document text
    • http://sung1.com/upload/files/pebavetabo.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/7232456666.pdfIn PDF document text
    • http://exosushi.com/uploads/files/74733206756.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/59485094241.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/73389298774.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/gekexuzimoti.pdfIn PDF document text
    • http://www.puhito.hu/uploads/fajejadat.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/37805237375.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/6788508394.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f1f1769f55116e5a1b52b2d3f1d6f4d/47713011927.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151949548978---wewufetetibifeso.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8286eb9be---lotupuloluwuzo.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/jogagusutorevevoxetokanan.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/33056144511.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f9e9f1eb---livezulakusasilimilinozaj.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/wexosemu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3006e8d26---13884427430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=samsung+s9+plus+custom+romPDF 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_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 10836 bytes
SHA-256: 0c4c440d79cbb2df6533d2aed69ce576e0a7b0ba2f4e91dbf20fd63350c15465
font_01_sfnt_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 18168 bytes
SHA-256: 92b753aa009949a276e1f75406ac345d4dce851b134a07b0c46097e2a6571252

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