Malicious PDF — malware analysis report

Static analysis result for SHA-256 358c363948c41a45…

MALICIOUS

PDF

81.7 KB Created: 2021-08-16 23:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee8b4b13e7c4caf3c415a53a68b3958d SHA-1: 13c62da80662e529e382c90423474b009310d133 SHA-256: 358c363948c41a453b535791600a3202738e5813e0bab2d841f4f79803c176d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e2b938d8768276c162918d968d664d0d/penoziwujexokutidiwudepa.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f85cde4685d---salatad.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/bekugebivi.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/lewazalodotudapiresajuse.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/19087625264.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091e64df0cb3---parozonofokaku.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/575e0378a492a2d3e2495f66b1a62aae/zujimefugese.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/ruralivajema.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/zugukejopuzegiwosika.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/62267623390.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/liteveruwivavegigagufewij.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/zusunisogoxubu.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/bepesugidafasagezumoxelor.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1cd4f152---72419959836.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/84938058542.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160852f7db3144---labenimemonisitutoguzarav.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7450d269c6549786f5fe51846af45b4c/rajaviripetexasurexowuw.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4aced02fa1ae7206a78d2a9631755cf/ketuwot.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/merazujafotuba.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/95bb6e968eb0d186ee0392ab20d267e9/musopajofalawukagixati.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/votuderepujeve.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/52533932535.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd06bd32a84---palejuxogokofegir.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/5813970120.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/rulelejavapimipowilitanek.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/73299359903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=printable+pdf+army+nco+creedPDF 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_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 16932 bytes
SHA-256: e206af5eabd7c2eced092b735226a2b45ed02d5d0ce8ab9789aeeb68db86133a
font_01_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10868 bytes
SHA-256: 12c09d98ddddd1a353939d56bd4b936b7c0497bd827c0477518eba520bcd87e0
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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