Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fc87229a4ffa28…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 04:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 654beaa4f961750bb8bd6dad41b9753f SHA-1: 5707cf287511432930c096b0570d32b4c8609acb SHA-256: 56fc87229a4ffa28c49d4eebf998f69c54ea12f6b6253ee36a87b2f46700ebc1
176 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, some of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect the user to a phishing or exploit site. The presence of numerous links suggests a link farm or redirection mechanism to distribute the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://widepolymers.com/userfiles/file/45437620187.pdf In PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8562cef2223a9f4fdf0c59d42201b9bb/tifokem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029cdf92cb6---dekirikopubijofugeja.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3440d7976---wovemoj.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/56369846120.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/95117519175.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/60120986118.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2eac9a113c---panajefofexusoz.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9590187c3---8950644899.pdfPDF link annotation
    • http://laserinnsbruck.com/static/pipefofudelag.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9addd80c99---59294869765.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/budixikoro.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/xipinewodawadop.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/90927730368.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/sulolurekibepota.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/81d8540dfe95ad246ad0ca6cdf2e1d66/96751071395.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/57790055275.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/pumapivi.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/62453053758.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7e62b8e742cab8eaf80376a61e9976f1/12095120398.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/suduninezudexorone.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e432d90c---zizininodike.pdfIn PDF document text
    • http://prograsifkalip.com/files/35075171457.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd47949763e---limotutogolenibemudefof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+islamic+books+bangla+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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 11072 bytes
SHA-256: 08c3fed49b47df4dddb0b8a9ee14f19420e7be0e8c8b379c3e151a9614053af4
font_01_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 18580 bytes
SHA-256: 4c57198d8dc8e40057081bcb16c33923f1c8b6492b7e7dc1a6071596639fe2b6
font_02_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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