Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee0e57b383562d6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-22 18:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 226ad9bf1d0f45c2103ea19f3c15b068 SHA-1: 2925defc0aaf296bc62966be37b8a1502a363949 SHA-256: 1ee0e57b383562d6f485f7fcfb5f58ffc7e55bdb555e9815294774406524a02b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cualuoiskydoor.com/webroot/img/files/dewuritesorafaninuw.pdf In PDF document text
    • https://egyiksem.hu/uploads/file/81428993268.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135313672011---wanatovibako.pdfIn PDF document text
    • https://posh.hr/files/48512521001.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/xaxunomuxapipukupex.pdfIn PDF document text
    • http://erpos.sk/data/files/vomejujetuduwuguzopim.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/7178064988.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/14220360543.pdfIn PDF document text
    • https://aksusu.com/upload/files/mikuvuzedixor.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/sisomifuzoluseni.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/simorusejebalukizogisuvux.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/bipoxupit.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/sujalowagexovifazex.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/zadosiximag.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/18768552935.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/zugokezapegogewajikisuma.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/75921085618.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405ecde964---67899312407.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/wakudabenif.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/matavokutixigovafojibe.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ninu92p3tgv9shibiekn2duqlm/24143360684.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/jemodonawegalesefamo.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jevufujimopexotalajaxe.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490a33d2506---navogoderole.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/91043676960.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37176352783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=indian+culture+values+and+traditionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89A 10480 bytes
SHA-256: 1077940c70678bbcac13e27c9566bfdc5fe325ca748177452e0987f02dc198bc
font_01_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 15696 bytes
SHA-256: 82a6d58b0537e2f21a66f559c297bae7791ea7d334384a67d9c5cc2d44d72a8d
font_02_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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