Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aa61826f30d308…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2faa8ef3a383017b4259c63c3502c9b6 SHA-1: 2efc26882ec91ac2a75300b99555a52f88303445 SHA-256: 83aa61826f30d30871a2c44c5281a123367abc6cb90289426a025c048c250e74
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF-specific heuristics related to link farms and compromised uploads reinforces this assessment. No scripts were extracted, but the document's structure and embedded links point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://windmill-bv.com/userfiles/files/51534293884.pdf In PDF document text
    • http://kapsalonindex.nl/images/uploads/fofofawodatubaxigamaxofi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a483cb637---zovunoj.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/82566590535.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/wivane.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/buloduzop.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210826_85D22F2F3FF37CD0.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/barajidimajasexifalubatu.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/443010_37985040487.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/bodedajijazunejod.pdfIn PDF document text
    • http://metallpress.info/files/88030236421.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/toponafonunijavelisekoka.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe411e6b4---50076965991.pdfIn PDF document text
    • https://irrisyst.eu/files/file/guvop.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5d3550e44267755a973a503ac3a1b77c/jafovodozisosubijaba.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f4e9246f5---wovus.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/654ep8kv90jgs8hpr09lj3srch/rosalurizisodaxodasu.pdfIn PDF document text
    • http://wirheiraten.de/images/file/zekaxalumowud.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c681d7a44074d5cba484c7f0e3a32397/zolelorivusu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/dd59a233b067e6cb461126cecf7972e3/wewugososalavunulazunej.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7eab845d5203a0f3911753a230aa855d/66632966469.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/v7p0ces2ags0bjdtdcifin931c/23639294147.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/78120858343.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/baubls0i1sn3o6d0knqc5g67d1/71574069980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=main+difference+between+osmosis+and+diffusionPDF 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

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_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 16024 bytes
SHA-256: 2b35e8972e78ed1459a338cd0f939e55b725b7680b425986d1895df4124a209d
font_02_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 10912 bytes
SHA-256: 10568c9b541038eee0f402271e9d93917a6047d2caf48a157095f1e63da45e77

Open this report in the interactive analyzer, or submit your own file for analysis.