Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e6ee48d7bcd32d…

MALICIOUS

PDF

84.9 KB Created: 2021-07-23 04:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9bf3393cc0f1ab2d96f2d65216f45ea8 SHA-1: 2e515afd6a5275e8541e1e9159b6578200eb000e SHA-256: 31e6ee48d7bcd32dd712bd2b314e8778bd3b3e45a708bca793a3018e38636f2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/37a52ea44b940f6ace151529eaf8abcf/jafuxi.pdf In PDF document text
    • http://diamondsnspurs.com/clients/12200/File/28408984191.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/fozopazovolasolunanowus.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/91013032216.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/pcb08ci59mv14gqf93in2mp0q5/4997213185.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mazasolipaxig.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/bekifekasojokupizasal.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6810c91d0---55155681138.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/aop3g4kijfgukc5qtf4hrjrdl1/voparixajaxik.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/gefidarogelajetidon.pdfIn PDF document text
    • http://podushka.by/files/files/zaberupa.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/39773584286.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/voputuwusap.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/29233100091.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/77362631816.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f534d53b00d---86959452837.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/6be622ae0e310bf899134079034597b9/84062608108.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff20482f6---vegetiruwibula.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/paxepum.pdfIn PDF document text
    • http://wirheiraten.de/images/file/40326669162.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hifniiuq07tvhvkhenb890n0ro/28307044216.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160991adba0207---88062098165.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/mesugefovosexor.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818287d0831---42226483871.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/foroxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+three+colorsPDF 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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16492 bytes
SHA-256: 0cfee480fa7957d73ab01a607e43c88975aa2aa5a5e5a308875c4d504501311f
font_01_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 9932 bytes
SHA-256: 67a19c8ce1278508cead0c7cee4714f830ee3673fc37e51b9948b516bd8984fe
font_02_sfnt_off00012d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1