Malicious PDF — malware analysis report

Static analysis result for SHA-256 df72c775be09e885…

MALICIOUS

PDF

75.9 KB Created: 2021-07-02 17:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c02d6e7f04e35268883766349c9bcb63 SHA-1: 390ff227b815a148a8b4e0a812f53e8dc9baf011 SHA-256: df72c775be09e885af43839f14666cd32653faf70200e3be553a190ac50dc333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other 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 related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bogelaipigeon.com/upload/file/7022743256.pdf In PDF document text
    • http://endemic-capital.ru/uploads/files/nizopoxomolif.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/11629383741.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/180d2ce7d3aa92c0d0d0f8b1cfa6d22c/zusosimovilogubesaga.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/velukogumunaxofufaxet.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f7135486acc1c7f9db1a3ac483b65c67/62604287572.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/bnuu93rbpiojvf36qf1cl5grgt/tusikodutinu.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/77756401105.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4876028b3bbf8970739298aae9eb0b23/fozaledelibizaxokibu.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/64051051194.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5aa1a3fb---berexupabapevomoxibodor.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/rusarome.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/95866883603.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af92398ed0---xujipivijibos.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bogotimafujujulovafeze.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/wolawewan.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/nowat.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/21889537319.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/lazudusizamemazane.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab7a9e92---28663992193.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ni1kcj2tpnluif7agq5ph73701/54355047483.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/bipoxajo.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/sarap.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160895d3a415da---fowotipo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/27898128701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=one+solution+definitionPDF 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_off0000c16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16E 10208 bytes
SHA-256: 12160d9967ffa65cb087ee2883698fea63e6333b9d9ae12e5d1583a340f6b7ea
font_01_sfnt_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 19048 bytes
SHA-256: 6028d349ec87080bd944f064074999a036c0c9f41340d22fc9acd9a608a3f1a0
font_02_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1