Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6d556839976944…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 14:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 927af700c7f74abe7161e909a52d855a SHA-1: 7e9b497f0540f977dc977a4c70179b1f4e8598b9 SHA-256: 7b6d556839976944162cf1f04a30208ea60742c049c007fc25ccf5ae15612e92
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://b2cexpressdemo.com/userfiles/file/kudupusedijotediforajotis.pdf In PDF document text
    • http://cordovajewelry.com/images/file/11918674509.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/gurenirolaruwoduzow.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2041c9b0---ralufajegefomukexokij.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fdbb5792b177b1451b5401db767a16e7/3655501122.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160707f4db5e83---dutezizaxejalokanefosi.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/detedofiwigusaxazi.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/22811130587.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855870ba162---ziviwuxin.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/dobofugefixaxilu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c878090bd45---jipuzotofabor.pdfIn PDF document text
    • http://cityfate.com/files/files/69469032406.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1941567336611303b5503b2.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ece41d34---dizozeruxilidepiluwodona.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdeee759f---19185760753.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0e8b53f2d77a2ba6fdc48e8b8d14ec3d/finoru.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/piditebovewoma.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/52328285841.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/40765544382.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150d443d8f8---rebag.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/dekowizok.pdfIn PDF document text
    • http://93564497.com/userfiles/81013556939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=online+voting+system+project+modules+pdfPDF 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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 18408 bytes
SHA-256: e5d19c1fe9e53d266c9eb2c982347cd5efaaa6b4643776f797aac3b371ae1c5f
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 11236 bytes
SHA-256: 88d9465a5faa8734c790baa62a70a0fa61148779ac23f9af58d5fba909f0c02d
font_02_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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