Malicious PDF — malware analysis report

Static analysis result for SHA-256 948815c912fe6b86…

MALICIOUS

PDF

82.0 KB Created: 2021-08-31 07:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad34f93fa20e0c528275deccc8ba012b SHA-1: 2722885d963d8abaac4186b4eb458bf699e6d7c9 SHA-256: 948815c912fe6b86fd19cdc8603a252653ffe4b8a9d8d15ce9c960fd4bdb230b
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f7d8d8e3---98606957311.pdf
    • http://qiuyutv.com/userfiles/files/20210702053653.pdf
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/92664884652.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1264b15470c29cc46445e0d592b89e6b/popuper.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6357c773e69322fb7a3a90b84260378f/85357870703.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad7a7c85b---watedol.pdf
    • http://saigonford3s.com/uploads/2021-08-09/images/files/38584436850.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ea3327f3b3ca0e2555e3368b803f1006/bewujumibebivuven.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/12989fb8393f463251baa19db89a65dc/31793565656.pdf
    • http://africareview.in/userfiles/file/xatulufolunek.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b790fd155e6---7261878187.pdf
    • http://garage-fuji.jp/js/upload/files/70651051287.pdf
    • http://frigotechreina.com/userfiles/files/5217604748.pdf
    • http://drivingtesttips.ie/fckeditor/userfiles/file/60461933492.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e0695b10ef85fca187085ad0879262bf/99722121031.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a21baa7c27f---34973297042.pdf
    • http://gazosilikatnn.ru/uploads/files/22437839032.pdf
    • http://lumieretvie.com/userfiles/file/vekev.pdf
    • http://accronline.com/userfiles/file/rodezufevo.pdf
    • https://acrgroup.nl/userfiles/file/wiverexobuxekogixarete.pdf
    • https://10glazsikeyrosa.ru/file/34407903451.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=small+pupils+alcohol
    • 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_off0000dccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 16792 bytes
font_01_sfnt_off0000f4df.bin
8d8ce351a06eeb2d22ec5b60c44d6776617c8f4cd9e1958782e84f30961a3cce
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17872 bytes
font_02_sfnt_off000122fc.bin
50504658381e019ab30324e5810936172d3557ba03be9ca55c60e54d833beefc
pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 10380 bytes