Malicious PDF — malware analysis report

Static analysis result for SHA-256 5622130ccaa7c079…

MALICIOUS

PDF

86.3 KB Created: 2021-07-26 16:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0e0f8fed744edd4ac3365d66c49ad12 SHA-1: 546052add09d91f534f689f097116f3e1db9cbc2 SHA-256: 5622130ccaa7c07963086f01a8dc4560b3b450b366dcde109dec915ff66d63fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d8d8c0bb9eb45626758f79547d6fa64d/kezijof.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a939a6d2b0---29829376516.pdf
    • https://medtek.vn/storage/file/karobi.pdf
    • http://originalcheck.it/public/img_admin/file///84031379101.pdf
    • http://askort.pl/Upload/file/44984126964.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8uevcnsl5e5vp5nvd1g7lgjed5/nabotulogalilajiros.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/42946120395.pdf
    • https://icbacademy.com/upload/files/46030400481.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e78dcdba8---24295908824.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a955538b57c---lupajetejepusuz.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ot1ps79539rkbemt5kjckbstdf/42738171275.pdf
    • https://mecaniquekd.ca/upload/file/gafen.pdf
    • http://dyglas.com/userData/board/file/86140279939.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mararexujusunovibavasuf.pdf
    • http://adria-ex.com/images/blog//file/26854889614.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160933a4a85f34---wumoluwejulalerapusunigi.pdf
    • http://strandedtattoo.com/file/wiwix.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/29283610840.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607090960ad76---wafuzolexujon.pdf
    • http://stavbyhes.cz/ckfinder/userfiles/files/64057253414.pdf
    • https://termofriz.rs//files/95005010935.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/8edce71da6afde9517702fef7b65d693/wonosotamijuges.pdf
    • http://dawahcity.com/userfiles/file/vemodadetamu.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b12479a36ec---nipobokipiximi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+charge+a+rove+battery
    • 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_off0000ee4a.bin
3e932f61d49f929cd64839fe0254a9542928cc715f26c2796287d7d2cc094562
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 17132 bytes
font_01_sfnt_off00011b2a.bin
63a0d028d3d591e2dc17a22961e14733d02a1a66a95119d2e642c4155f0d415a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 10496 bytes
font_02_sfnt_off0001333c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 16792 bytes