Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e363fe9537010d…

MALICIOUS

PDF

73.9 KB Created: 2021-10-01 00:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e865df53255246b5bb22d09dab39ae4 SHA-1: 9bdaa574711fcc483e84b8b66e44688bef171f68 SHA-256: e6e363fe9537010d2dd705fd29b222c9e9d08bf77156dea5d1c3ae1865fbe6a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads. These links likely serve as redirects to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kimcert.com/E/file/13044359250.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210906073417.pdf
    • http://flapboxes.custompackageboxes.com/userfiles/files/vokuxexewolamumo.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/35125670935.pdf
    • http://njboyuanchem.com/upload/files/45971178842.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/96633899046.pdf
    • https://jmtours.co/aym_image/files/29083287291.pdf
    • http://villacappuccina.com/userfiles/files/94341325812.pdf
    • http://ilkconstruction.com/Images/Media/files/jipakowumuxiranamiwu.pdf
    • http://kraemer-duennebacke.de/files/file/19413951217.pdf
    • https://premium-house.uz/images/file/42613537206.pdf
    • https://wildnaturetravel.com/File/13540283962.pdf
    • https://wcfkenzi.com/ckfinder/userfiles/files/72668591280.pdf
    • https://hasekei.jp/userfiles/file/mizakas.pdf
    • http://abwingssuffolk2.com/uploads/files/lizitogemubes.pdf
    • https://kipass.fr/userfiles/file/gufazewigavajukorosaji.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614318ffc28cb---jatuxexomonerudo.pdf
    • https://ringid.vn/ckfinder/userfiles/files/kunesonapukizobimeziv.pdf
    • http://svenskafik.se/uploads/fckeditor/file/13119937870.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc2b5af074---92973560921.pdf
    • http://alvitraders.com/files/14801533243.pdf
    • https://tpk-m.ru/files/file/vamomularezewajili.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/97936411077.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615625c940bf3---51225960847.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+scream+painting+interpretation
    • 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_off0000b9ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FF 16792 bytes
font_01_sfnt_off0000d211.bin
6ef23feeb4e7341d078682218c0e3cbe29baeacf7fce3b0e253fb4194ee6a9b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 18240 bytes
font_02_sfnt_off00010164.bin
9540c0415b25e63c40f0e2659054b2eae89b2d11ac43675410f94a21c95a4509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 10740 bytes

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