Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fa1c9eea7e89a6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 23:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a7609947398c83653c6bab7f8f071be SHA-1: af2ab5224a087365e28e829d216fab73d60c2652 SHA-256: a0fa1c9eea7e89a6a624eda1f4a2e8ba3bce358db1a45e4c69e08a82b95a6c49
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the structure aligns with a common tactic of using compromised sites to host and distribute further payloads. No scripts were extracted, but the PDF's structure and URL distribution are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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://inwebjor.ru/uplcv?utm_term=feeling+cold+and+breathless PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c07ee3ac9efe22506feb848af4afe4c0/faxebatofividawipanem.pdfIn PDF document text
    • http://ccshecea.org/upload/files/11804526001.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/b7kubjkqkpgno907iqalkdsbi0/16694533589.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f93116bd---wipevomopag.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/96330765192.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4d3bc2d89633f610a0d95d229e0740c0/zisadusobamokolupubuvum.pdfIn PDF document text
    • https://festacontinua.it/public/file/bipurexokosidoza.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/84969500091.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/gomilozewen.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/dolagusakebe.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/98962960490.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b1496fe79---falozavumufazewexo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f4e3da343045bb63627b8e8f48d029d4/51237609328.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/46835093575.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc21002180---57775038548.pdfPDF link annotation
    • https://harom.ro/files/file/jizuwijaridaka.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/joxuno.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579764cd9d---95268246295.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/xiduwivutunosivigikozob.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/ponujodikitamenatarepubuz.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59f20fcce---12120939389.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 10764 bytes
SHA-256: a8f5c001b3d0b8b3fa3cb9b64b1ee582750087b32bb5c078d586d202ece00ae3
font_02_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 15388 bytes
SHA-256: 1ac8f121394a283e2fa3f256c274f583241344506068454a5897c55ed0645971

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