Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f88ff9f962abfd8…

MALICIOUS

PDF

88.7 KB Created: 2021-08-05 03:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81c7280c56bfe5a9a2750e83e6a96c72 SHA-1: 6a7806ee14f2c5718751dee2bf289c746cb8b43d SHA-256: 7f88ff9f962abfd89ed0a6e23ee305acb83be68f574bb14ca0daafe9fc481787
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://accuratesearch.com/userfiles/file/famuzogosemexa.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/110138464856.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/nefimojelonux.pdfIn PDF document text
    • http://otczenacts.com/media/files/47950450990.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5af684adeda7f5c0cd3decad1b9938f6/figujefuveboxope.pdfIn PDF document text
    • https://kham.vn/userfiles/file/83061666591.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb37b8e63---78282524211.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/83331536607.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/92432478402.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf81ca24ec---rujasedurivosuso.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071720c8e3d7---riradanofolaxamolopiso.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/wazitakosejogatesenutak.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ejtkakm17iacu4s1sifg8tbk3/vazepofajovijoti.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/78056159673.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501061750471631.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/24127084743.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/bemigokivusob.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79df20ed23---koxavakij.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/229aa876fbd625f68ef5012cb8ebdb2d/zajemiluzutup.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072432f966ad---kodije.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3b795ece---22396609551.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983e609c77e---24724103654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=automatic+clicker+ios+ipadPDF 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_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 17152 bytes
SHA-256: dc411fc20d83927cb43d4621350833cbec4ecbc333ca3251cf2f82d8d8f43658
font_01_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 10744 bytes
SHA-256: 62dd81db3ff142de5128ee9692d10cb24c6f8e5a0ee0b68bef86688a85602851