Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff8d3c976a90a72…

MALICIOUS

PDF

100.9 KB Created: 2021-08-13 10:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d923ef0b05f7511ab372493f5548e268 SHA-1: dd04ef60f076d04ab1967d1709a2ea4bdadabfc6 SHA-256: 8ff8d3c976a90a72ccdd7c81ee45e5b61410f818b2f10846997cf1eb01b7acb9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload directories, suggesting an attempt to deliver a malicious payload. The presence of a download button lure further supports a phishing or malware distribution attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

Heuristics 8

  • 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.
  • 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 https://capital-tic.com/upload/ckfinder_temp/files/20210621220455.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210805210532183.pdf
    • https://eletmodguru.hu/files/files/femumom.pdf
    • http://kunbot.com/upload/files/71561710614.pdf
    • https://digireg.cz/upload/jokupibetuj.pdf
    • http://wf515345.tw/CKEdit/upload/files/nubilozarisat.pdf
    • http://tunglamgarden.com/images/fck/file/2520899258.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/71vn1c0bs89070rrel0litnr9a/lalodo.pdf
    • http://watsonwilliamsreunion.com/clients/82103/File/73780031864.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4s66rl4n3k820sni39m3mdr22f/kaliruwawusemajobuwo.pdf
    • http://www.anclupnapoli.it/userfiles/file/denidasobitedal.pdf
    • https://bepxuyenviet.com/upload/files/pixumavi.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f46d4977bf---81108519020.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/21ff60fbede6c4674b9a35473899d236/majaxor.pdf
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/52496802217.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d5f5d999a---jonurapokunezusebugidaf.pdf
    • https://travelstore.tn/userfiles/file/17019195541.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/n1g0sd6ca6truk7an06f9it07i/34109641435.pdf
    • http://ascensionchina.com/userfiles/file/52871618743.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/94325743298.pdf
    • http://purofirstli.net/userfiles/file/nejaporopifirusizadig.pdf
    • http://zonweringbelgie.be/ckfinder/userfiles/files/70029610372.pdf
    • http://mya1fc.com/files/ckuploads/files/luvipevaviv.pdf
    • https://n-zvuk.ru/upload/file/bimig.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/36708421257.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c05d6fbff---92599759279.pdf
    • http://zae.me/datafiles/file/17579705738.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=descargar+firmware+engel+rs4800s+mini+2017
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f382.bin
9fbeded7cada9668d70e4d4a78c3e5864c793162aa38a3c646ca4793b3355556		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 11176 bytes
font_01_sfnt_off00010de7.bin
a973fad901ded85fe8ac97b569e5c46b3338b6578dc07fde1106faf38c2f25eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 19416 bytes
font_02_sfnt_off00012e38.bin
8abc30f570e4038006c91f80290224c122a05291611b15e8a4b3d75a4b62aa56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 20608 bytes
font_03_sfnt_off0001639d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1639D 16792 bytes
font_04_sfnt_off00017baa.bin
9f01deffc05e0d9db0854a6dd96281b2b73d3dc7117d353d797792574ff66d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAA 1800 bytes

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