Malicious PDF — malware analysis report

Static analysis result for SHA-256 34943349cab0391d…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 08:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d5c6bf87a213d7334ff8ab7ae5702fe SHA-1: 20c0e157e750c9a4b7fb7a0b5bf85d8de2485543 SHA-256: 34943349cab0391d58a66c7c216b4bc01f9762552b0f5c91f619dac9af177a08
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://ecogestval.com/userfiles/file/mifufovulog.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e0a70ec094---goxikitusezenejojilutixid.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/58148901655.pdf
    • http://lideparts.com/userfiles/file/1623388745.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/62kd1o0h6e4jcgght0of7fkleg/52075277572.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160968880389a0---golonenelolawefuwuga.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc155f27e3---fagine.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1fkm9g5gvsrt2lsu3rslo56kbq/22650502988.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9s3qb66p3vm1m7hcthjq1fb1k8/kaxijujamifuxujudofamu.pdf
    • http://innotec-industrie.be/userfiles/file/muvibipusekoxakugelubim.pdf
    • http://vstarmp.cn/upload/files/20210622_012803.pdf
    • https://kawanmto.net/contents//files/lotibafuzotozitaze.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/46b618753e9d6dc6a7fc34a1780eebc8/jewowifiwuv.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4mqbc6pjotncijnla9l2sifta6/pakugidixagujajabodu.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e88c556231---33072631639.pdf
    • http://hataylezzeti.com/resimler/files/besufirunusab.pdf
    • http://adabaskimerkezi.com/upload/file/gawikefozufuniku.pdf
    • http://szao-spb.ru/images/news/file/gukamelemevepijiz.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bff5b683---12679754850.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6cf43d4f321f52fc6c774685b728e0b9/jigelokeniz.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083995cc13f9---zajenizozoke.pdf
    • https://alihuata.com/userfiles/file/nalerigilorebiz.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hflacthejs0os17uaag4147tlc/julujutanetogidubitun.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc4c69aaa---tokawiliropox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=about+all+the+bright+places
    • 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_off0000edfc.bin
c89cd0e650b46bbd0e01be0b3efa8c5950b71aa7ab5e23df2258273c229036bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 17312 bytes
font_01_sfnt_off00011bc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 16792 bytes
font_02_sfnt_off000133d8.bin
d4dfc5e027669be4009e02714b9a4f572dfada9656e534cfa6a8e63cb35e7177
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 10768 bytes