Malicious PDF — malware analysis report

Static analysis result for SHA-256 321db1a49eebfc8e…

MALICIOUS

PDF

106.7 KB Created: 2021-07-25 02:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5b99c6db5aa2f2dba987967a01f7fea SHA-1: bb41b571e8b2e55d31791d5618d36805403af99a SHA-256: 321db1a49eebfc8e3d0964806f8885649fae98bc0a5adc37d9573a4a6594913f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malware or leading users to phishing pages. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, many hosted on potentially compromised CMS uploads, supports this. No scripts were extracted, but the structure suggests a lure document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd747644035---96847526129.pdf
    • http://timavoshipsupply.it/userfiles/file/rozugol.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2699c5158f411c2653e410fc15f468f9/parigesipig.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075344555333.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb6583b618de20505d6545291ff8a22f/dejovipovatujor.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/7bd17eda8f6a2b4f744119617eab1ed3/26914257538.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96903d284---wezuxinusojibufo.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1c3e055d---98439049704.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789a913343---18004709480.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7c4f7a6d3ba987746178e6c9be6f5590/numuxunetizeserefoguzokow.pdf
    • http://momsystem.ru/public/file/misomexagorukibeduzegato.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3179613a2e---13320229171.pdf
    • http://laweasy.kr/userfiles/file/zurutezin.pdf
    • https://cochleartudaskozpont.hu/files/1508402686.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bmo685hl7jhqgkd7ph7a5anl15/34447052168.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/83ks9asp01l46acpn6avpshsf7/19801350662.pdf
    • http://diacritic.org/travel/app/webroot/img/files/5206076195.pdf
    • https://panificioilcavaliere.it/userfiles/files/22751713055.pdf
    • https://ringid.vn/ckfinder/userfiles/files/79244792467.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f377dfebf9a53a25e771c88cde5729c7/zasegitubene.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/58dd82a52d6d7ec6b3f5a76c54e43646/kotopugenoluzekum.pdf
    • https://pisangmanis.com/contents//files/75765691085.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf07bb0564---72778330822.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what%27s+another+word+for+master+of+ceremonies
    • 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
stream_006_off00011a69.bin
50d6f3dfa8dd1154e1d5054ca693a8d332ec9a6d186520598a236b4155eb1be2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A69 19264 bytes
font_00_sfnt_off0001018c.bin
0126ba8221c9058f6b97c56a7760d2a8cbed9f0e6384436db67566e1105c3f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 10808 bytes
font_02_sfnt_off00013a75.bin
b080854a59074029b9608539ba9a085c75053fb9dc2807050855d44d1ed9c406
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A75 3732 bytes
font_03_sfnt_off000148b4.bin
a211cd73179e8dc14124d11a3ef40f3da17307df3b7fcc502f9ad5953667af58
pdf-font-stream PDF embedded font (sfnt) at offset 0x148B4 23904 bytes
font_04_sfnt_off00018354.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18354 16792 bytes