Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a3e6b257e11e82…

MALICIOUS

PDF

93.9 KB Created: 2021-08-29 04:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b69a7315c866f06722a72be64668034f SHA-1: 3400956421c1fdfb8c9db44469b2483fd959534f SHA-256: 85a3e6b257e11e82434f62cb81e1e1cfba03503e4a05d6ca683b14cb18b000ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, identified as a link farm. This suggests an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ad72acdc652---44252727946.pdf In PDF document text
    • http://artospace.com/pics/file/dikan.pdfIn PDF document text
    • http://prestopc.it/upload/file/lulivifidoleraso.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46e468c46f---36692634485.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/66168451120.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fdcd26116cc56bd36e7d6893250bff5b/18344195667.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/98927379980.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5a13c7734d8b3199e3d4fd380d934b89/8146256221.pdfIn PDF document text
    • http://cabini.it/userfiles/files/lowuwib.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0def6917d20679432fd6cc1c7ada1468/likemujavazujuw.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1ed455cuq882q3cfnnt3s6nplc/95278370537.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/45649344372.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e328e48a---66387881834.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/jodadebagijifewi.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/pazuvajipemorojijij.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc29e6b71c---71896230056.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/75338003050.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fdvqbhhpcqfkiiaas1u3si6qkq/loxojegavebafedum.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/xoxegizevajabizozenamesus.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nigibulodapaj.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/9995744902.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fd203097199e665d971107f9060a0163/31216655867.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/vurarerimevuvuritabuw.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/zenakakipujavopes.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/dokijotomaje.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/67091243987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=signs+of+central+cyanosisPDF 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_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 10700 bytes
SHA-256: f0674e7f4f85d57af588842088011564e15a1fba7a04f52f9ec7d1456fb573a2
font_01_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 17616 bytes
SHA-256: b96f84f5b2bc0b3a6c7587a60ee25a9430dc2d00f9af55c530d9cf25eb8c5ce0

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