Malicious PDF — malware analysis report

Static analysis result for SHA-256 091fc7bda24f061a…

MALICIOUS

PDF

96.9 KB Created: 2021-07-18 07:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 73d4744b4a4fa8171e632ed4a458544c SHA-1: 4401588495f627ac44f68c0103d0a0c00392d8c3 SHA-256: 091fc7bda24f061af3583efe20103078cf20add99bea1eea98504576bff2c5c9
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, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5de02cae---35906925699.pdf In PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9aa321bf3fea263bb8259280b9ec2664/lomepomapakagulexabudawu.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/gujaxuminuzi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7372893f1---kulaxuxatolimirasetekubar.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/jitawozaduzulafejon.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/mamufupulivezilivoxor.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c27e74a01b---jawasuxetuka.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202107109257_119042400.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608520e276994---wodukekewelunuzegek.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03bf49c086---64994195751.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/91dc8fba47f5de7243f41a4932ed09ac/55396599460.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160853acb44b85---sivujepigebinusinuvux.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/zuruburuduvuv.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2r47kdkcilrs1henoo14h9mk20/31966273778.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/xekotivipibemodugax.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/891de0af92cd913b181b13bd8a12cab2/jozikafilipe.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2035dcccfe---60225774850.pdfIn PDF document text
    • https://coevent.ru/upload/files/28173625097.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/30920965000.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/miu43f2nhqu7746g37hi7oe1gd/75951831830.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/52445157964.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a6349a51---38427593331.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/03b2c992962ddf8d3061e29d60a5082c/14844851109.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/vuzerixatudov.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-24/20210524152655151097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wife+reads+out+affair+texts+instead+of+vowsPDF 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_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 10648 bytes
SHA-256: 504a37c9a951657e3401a5c47bbd6a88d328c60b336aa7011e4bb2c3f892111d
font_01_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 18136 bytes
SHA-256: 19ae05fab4c55089b13a595499a50ededc0b9da93c28815f03e9a16bc2e070c2
font_02_sfnt_off000147f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001600a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600A 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467