Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d251b0f848267f…

MALICIOUS

PDF

86.8 KB Created: 2021-08-03 17:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06f1cf4bf578265b26c0924e1207348f SHA-1: 8b93931d7b0eb9df4b01113d9e7ddff67af0ccc2 SHA-256: d8d251b0f848267f23fdc98b61ce0930954b38613f9ea36d234d821d87903fcb
176 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, suggesting it's used as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised CMS upload storage. These findings strongly suggest the PDF's purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=vocabulary+power+plus+level+11+lesson+14+answer+key PDF link annotation
    • http://duepassidalcentro.it/userfiles/files/51060229709.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/67026663848.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/vemewukiloralisizemubupa.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/29968941445.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/vefenumizujibusopaj.pdfIn PDF document text
    • http://hncastlecable.com/d/files/lutunemun.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/49023468972.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/wofumolupakejuvakajowaf.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/godokipeliruzofadi.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210712_8CB3CA52FD981997.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/rerefojazebogoxidifiga.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/78855066188.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/21f2155aae5ddd909ec433a0009f55ba/66760828985.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a15b21ea---ruxosagowumebosoker.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde3c7a8e83---51479010004.pdfPDF link annotation
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8e13d3fd---1193187062.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sogejonivexuweziw.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3d95b4db---kozubowexadafisadekotu.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/jibev.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8vlu48b5nlr83oeppq5esh75b1/75253322179.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/21285165173.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xujemebefeposajututak.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79aeb4fc6---zebugamapediz.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 18240 bytes
SHA-256: 6a5eb3299ed2e65e897c73e871c4a2cd3a662cbe1a6d03b794b97022d04da9a6
font_01_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 10876 bytes
SHA-256: 1b0ad377bf6bb76e91ddc1715078209ff13526c6f7f48c5635423b14a67be71a

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