Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd74cc9dd7dae844…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 13:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bec91695909b5a44623d048854aa82c3 SHA-1: e1d925a6f39e41d51dad99ed1b26b0973611822e SHA-256: cd74cc9dd7dae844a0fdb71669ac4ecafdaeace4c104f5fd26bb5cd60a561426
176 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URIs, many of which point to compromised WordPress sites hosting other PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8538b1fc2---53701398643.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/sub21qchk7vjk0gp8mmbhcp8n4/piwob.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/67776677926.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3al2rjhsq5fsdq4rdkkmpd95ue/93744431992.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610328f83ae27---61617968270.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/kipuwitejiduf.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16100f78a30877---10855651259.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vodavixejugekodo.pdfIn PDF document text
    • http://kgmda.com/upload/files/faxiponimizonab.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/13891223850.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/boxew.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2834d93ef---nigewobujadezorafofune.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ok4rbkaca293s6nkmbntmlals7/dijifititebilogebenujetub.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161157d3ea352a---80430489375.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/jumotudebunexevib.pdfPDF link annotation
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a753be5c812929cebf570bcd7bc3da70/39543447259.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/zanodakezoxogofano.pdfIn PDF document text
    • https://actor-conseil.com/files/file/24637117464.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e453689432be4ddab55fc5d53497ab5f/31888532245.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/tigejekumilufusoz.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/firatijudofolodexotexenaj.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/68945658781.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/16d1d142cba80b9aa616f50feef8cf6e/lulerilagolopenipozag.pdfIn PDF document text
    • https://udruga-invalida.hr/files/54358182250.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9js2ulhvva7461e15spvuk7b5q/jisedezagezapezimagak.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/44611182997.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/56846557528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dwg+trueview+export+to+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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 16712 bytes
SHA-256: 889115b61cad96503cff6089eefede04c3b82cfd4e8778eb59c9510a9c18e2a2
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10548 bytes
SHA-256: 1c794d5065d6733a73676765668d34b0954593966e736207d2ebb7cb5dc538a4