Malicious PDF — malware analysis report

Static analysis result for SHA-256 87379d379f544bce…

MALICIOUS

PDF

92.1 KB Created: 2021-07-03 04:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1a467124c49945d770eb687c2d11ede3 SHA-1: dbdad52af9dd64f96774221d33ea4589084c7f04 SHA-256: 87379d379f544bcefcc0fa8bc4a0e7aa402851fadd004b8cc33a38813759b328
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicates maliciousness. The document's structure and embedded links suggest it's designed to lead users to potentially malicious or SEO-manipulated content on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://ildiko-szepsegszalon.hu/userfiles/file/30387264018.pdf In PDF document text
    • http://macautemple.com/userfiles/file/11940720646.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4736151ac1---liwefapelunigitise.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/43d556fc815c72c3d40bde25d43e4610/89655090629.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/kalilolodaxomisurutubi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb84f04bce2---91432231261.pdfIn PDF document text
    • https://bataretak.com/img/files/file/29966814105.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160793518b04ef---zukepetokok.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wunonoxufija.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25f75bdf8---doxenezarapule.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a40bd5e28442a926c2a42504b8ff957e/sirelufu.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/gekagifejajukizisizetibu.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/23139642422.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/92255771232.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/livujefazanakubisulox.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/puturirunasupokimovumuveb.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856241a55e9---84980487468.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcbc5d270fb357d73984037cd9a3d58a/jojagi.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/9673522181.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b9b85103---dosepaxumejufa.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/dbd7d23ec0c901956d7ecb5cb1b47d1a/67023246311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=square+root+multiplication+rulesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 17796 bytes
SHA-256: f809aeb52e20630acf40ecf925b0908edd0dd1cc785070a3b3b8a9a92403c1e1
font_01_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13218 10856 bytes
SHA-256: afcd56ea7c578d900599b3f16d9620661f9fa560a9bd9c13bf43fb88c4021168
font_03_sfnt_off00014b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B16 16252 bytes
SHA-256: 6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b

Open this report in the interactive analyzer, or submit your own file for analysis.