Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3ad11bfdda319b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-06 17:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 317d2ad8155a739b7299e03b6a788399 SHA-1: cf72a3e6976ce0915cd0f2b546aed5df08966722 SHA-256: 0e3ad11bfdda319b5d43ced1f5c6f70d3ce9209a18953512ce4bdbca41c4188b
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier also flagged the PDF as malicious. The presence of multiple distinct hosts and a link farm pattern indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 5

  • 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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160953afe19445---rekepebafozipez.pdf
    • http://jinanxintiandi.com/userfiles/files/74317273638.pdf
    • http://vidol.nl/userfiles/file/jarazaraluxinobozam.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87b5bf468---bemiloboture.pdf
    • http://axiomestates.com/userfiles/file/baxaduruferu.pdf
    • http://ccswcd.com/userfiles/file/37320673912.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160708ebc8b295---xarakajerijuvenulu.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8leg4f8ccias7v1dsbglhvpu6j/refijowojowuduludazo.pdf
    • http://antifftech.com/uploadfile/file///2021050520272912.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f75bcc74659f346e56b3d1a5894c0922/51819225738.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/28c2115343674a2515bd232d5d52a659/75108217614.pdf
    • http://vimbark.sk/editor_uploads/files/18290449570.pdf
    • https://sy-tech.eu/file/4445877482.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a00f507106846395019e4022084c58f9/97025008133.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4f513e49---zexunav.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df437b4f75---rujuxosi.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gamejolidejubizivekotu.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4dbd20eb9---bazelur.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160baa99444493---13530429789.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/481b053fe76e7b5b1cc6111c3017f6e7/76261989001.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/41317021013.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/21i2hpd73om3hieio498k3g6aa/14164115844.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a4ea5a34df3bbcd7ff3c080f80f12e34/41951163744.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d977eeb43---51957815881.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3048222d9---fiwodomatijum.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f1f96e8022c04bc1a93cefcefaebbe86/83061196175.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6a4941d4---67918190935.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+change+notification+sound+for+messenger+on+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3e.bin
327d7f55da970bfd0aefc3f37c8d3cbf5261525dc6abf919baf99bae6c37d48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 19340 bytes
font_01_sfnt_off00011ebf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 16792 bytes
font_02_sfnt_off000136cc.bin
258185301f5c187fe64772610f194eae19a2f5abdb8965c236307dce91ee621b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 2184 bytes
font_03_sfnt_off00014081.bin
adea968428fcc529b58aba2de57b00635cb76e12f4f50dcaee842dab267b22f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14081 11052 bytes

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