Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddb81525682bbd0…

MALICIOUS

PDF

82.3 KB Created: 2021-08-24 19:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b7041b1b69606e5140c30f7c3e2ec59 SHA-1: e3e73478fca4eddc5e22d89d38de1ff0a927706d SHA-256: 5ddb81525682bbd0ac4ec3f6087cf64b7164f04aaeaa27e15a2d211898dd5cb3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kadh.kr/bobod/upload/file/25512813978.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86695e3d7---92008485609.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6d2bfc3c---97274639021.pdf
    • http://bordahusfeldolgozo.hu/editor_up/31678185171.pdf
    • https://giasidaily.com/uploads/userfiles/file/88572540054.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/edcceb73bcad3db14742254ca35da0a8/35284404726.pdf
    • https://priscar.com/documents/files/jijebifipebab.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v02sh3p0a4fp6v7o3d3giudbak/58945185212.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9gkf3f2ic4l61ih8bds3u6bo3f/gexubuzububevoxes.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16071c35e80e5f---60151244105.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ac760bc6694---21066524410.pdf
    • https://cubic.is/userfiles/file/63453494189.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11e09d02f---nemonasuxupifizi.pdf
    • http://pallenberg-busreisen.de/uploads/files/boxeralozozadekomases.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a89e6fdcbb3deed46f66abd5a044dd2/mogurasawujiwogok.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d9bb0b7c---15510277626.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d99fff1ba8d1fc19939a9cddda02f695/nebewubewozupi.pdf
    • http://www.moyekolodin.com/files/xesadotikafaxe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c0021e5d---potoxibenutonekivo.pdf
    • http://solemarservizi.it/userfiles/files/nedeg.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kujinigexobaf.pdf
    • http://igigeothermal.jp/userfiles/file/gevasuzazedomimova.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4lfffvt9h8utveivhothi53krh/rubonex.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114932635389---bikajozezavufetevi.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc62955962---xazorumelefididorexiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=coding+sequence+of+mrna
    • 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_off0000dff6.bin
adc336d306c87cbe38362cf41dc6065fe496e6c5b7213e60357f4ff20f1a085e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 16184 bytes
font_01_sfnt_off0001091f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 16792 bytes
font_02_sfnt_off00012136.bin
66cc8ce75595c78551bc121f13cd4ca69e28517cab920c9e8e0d52d486542f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 10952 bytes

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