Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bb8d1c002a5be9…

MALICIOUS

PDF

87.8 KB Created: 2021-07-17 07:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91ec2b139ac7311c6490f650aac8ad35 SHA-1: 4ce6cc0dfc76642820b2fd913430430f42a9bb7b SHA-256: 71bb8d1c002a5be948ebf4f91359b0feaeb736332d60e7fe1280cf0ea6b10534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/72196804759.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3ffvcgp4ap6fh90rehd0rcu1m8/26588461416.pdfIn PDF document text
    • http://placc.info/up_image/83087876023.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e154aae7e---84125994088.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5b797517ab10caa3d846b9b89b650bbd/dufefizufitepige.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/61543935101.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e5ee95d9am0ugbrmgpdue1bpou/3896552229.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f6a39ee4fc6b63999a1f98e76399df59/lifurexuzafonumabovuvilar.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8a71b038f6bddae69a6a6050d7eb1643/18063555239.pdfIn PDF document text
    • https://tomas-music.com/contents//files/xigojesaku.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba776b9de5c---wasazof.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/bowavazefeligarilezeruxi.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/29799846641.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35290a6d3---tuwunikokoxobakix.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/66676579144.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/af3db069a94be0d8efce61606d534a77/72038958500.pdfIn PDF document text
    • http://sb-78.ru/files/file/wiwesol.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9bc50025---58828044130.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210523170857.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e6723427---83921153681.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e4f8e6c06d0fbb498255877db444b252/riroxekono.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1889a25caacf20bf5aec6fbcce434ef3/27174259757.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bb90affa1---51998525502.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/derufogovefovate.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609981768f83e---nizekolavakononi.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/setopobuwevolotogana.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/853fa6ec29af4152f4c6c84a792d555e/nujubegilezijovaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=first+signs+of+a+coldPDF 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_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 16560 bytes
SHA-256: 6a5de161af29a1b3a7c5dd4b489c2a27db81bdffdbfc649591ccb3504d6c88bc
font_01_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F6 10496 bytes
SHA-256: e3348887ba7a5f7bd52dba4f123680d6a832d293cd5e593ed8f3d900593a4fcc

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