Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a1c6b48137a969…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 23:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c2b1574f5a7737f31262b037d852f95 SHA-1: 4506ddd865df83cbb72dff30bc758584ef7f7e8f SHA-256: b3a1c6b48137a9698fb63d5ad84d71af7fbe8796141233f1bd46dc6cf9e91ae4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the heuristic firings point to a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jnapid5ppt77ma5dmme6vipv7a/ribawisakutodazuviko.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///20219455639201.pdfIn PDF document text
    • http://benly-carson.com/product/files/20287984167.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/18884566051.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/nabinesajafukulus.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec99333681---2871933268.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/poxexa.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/wikopewo.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/14315820491.pdfIn PDF document text
    • http://turatabor.hu/media/jarid.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/85495971093.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/62552618846.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/34447807779.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8996ebff2---5777345719.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/wogopebigosusukokulorizo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/42192685282.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9e21debe38c22cc0c52ba2930cef529a/zolakudatinabiximiwaki.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/fipadegugatimip.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/88496759249.pdfIn PDF document text
    • http://clingac.com/d/files/kefirenir.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/nopit.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/wakusozavotoronopu.pdfIn PDF document text
    • http://goldia.cz/data/file/15155034889.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f45ef099e---zobujenika.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/zanefotugofizikufifi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613610f7bdb04---35562763536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=game+paling+sexyPDF 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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 17448 bytes
SHA-256: 02e799be8de691247869f96ccb953a2575a92f0841e573dd07c3da50e5d2cb60
font_01_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 10532 bytes
SHA-256: 5aa8398c8c0a6ab4b34ffb822489ebc70e9da2cf7b76f4494b04106144d0d638

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