Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd31484f8fb95683…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 06:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84663165c498a4c24da5a2996f791936 SHA-1: 84813365b805ed64bd45b6923208f9d791abacd3 SHA-256: bd31484f8fb95683a0a8e738d6222bc97ead8b5bb4856b862d12907d0d15e3bc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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 http://uelzecht.lu/userfiles/files/kibuwuroluka.pdf In PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/nixufedutiviribuwewagofur.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/92450233627.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/66362406458.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/16916765783.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47560376633.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/xojipupemaxumufo.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/82906777741.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/vawavi.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubukezixifapolokotagis.pdfIn PDF document text
    • https://italvaping.com/file/40827145927.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/21926366843.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/68jp8te6klhnjlo76ll17df6uu/waxesewitukevojef.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/10978873323.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/zusizizadiseri.pdfIn PDF document text
    • http://koddous.com/userfiles/file/vopesa.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/20755244367.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/xididogagefil.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/dalup.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/34173207944.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f103df45aa9d89461162c2d4c783bbec/31746704295.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9df74ebe2982b19f229c0ce1bfb7cdbd/83898352010.pdfIn PDF document text
    • http://immopolignano.lu/images/22705674771.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/jekazeluxafomarutofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=average+temperature+in+zion+national+park+in+aprilPDF 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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 16036 bytes
SHA-256: 0668bb2dfa1ef506d82eaf80e20ed375f6d4675011f7255ec1573541c7488b71
font_01_sfnt_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 10728 bytes
SHA-256: 33c4dae24fc173c79772c5b21a7ae00b0866db3c6a9b23f84bd321ecb5d7cd35
font_02_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1