Malicious PDF — malware analysis report

Static analysis result for SHA-256 8465810c3b2b4367…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 07:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d18379fecf866f56d064e9ffa76a0e5b SHA-1: c636842d7f1f2d50ff9167c4a5ba5aaef0b14aee SHA-256: 8465810c3b2b4367ae90bbf796d0246cb5bb6145ed83f24787b8dbb02ef9db2f
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The primary function seems to be redirecting users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=manual+do+software+primavera+pdf PDF link annotation
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/93e2f9c99a6c3e1e200c1ffdba05df25/95677390692.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/nubutebeluwikojexovude.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/jetebe.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/92104761901.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rjdmk5jrr36e897vgrao5lqb51/xajefideposuluxobazibo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074521600beb---bixekuvefak.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/85c837340f559b772e4068a0363730d6/14281027369.pdfIn PDF document text
    • https://avenue102.com/uploads/file/21498780500.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6rr75ir8l1miimj104nploi0v0/1094924198.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/letoxumekuz.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117f931e4acf---90753400738.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1611e4af3b83b6---55532871266.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072359e42886---fileme.pdfIn PDF document text
    • http://riversedgefm.com/files/file/64311395674.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/zenuvetitujesite.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/dixobuwotesexozereruxaf.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/35331274313.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/76782583142.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/55807475635.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/jenelekemaderejir.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16099ae61235dd---lenimomojomatejug.pdfPDF link annotation
    • http://infinijewelry.com/userfiles/file/96303737198.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/33913677861097bb2b0bb6.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa31b9104---95323989136.pdfIn PDF document text
    • 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_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 18320 bytes
SHA-256: 781c9cea41943b70c084a661c23983e59f8d6de72d9b31412c562f7c11320c39
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 10904 bytes
SHA-256: 646b75cc64e3e4d9fd826bc1367131130b38a41e6fc859e1095b7db756c0a50b

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