Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed515b37c03ee5f6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 10:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59cad16c4cbdea4bdc4203bedca8f84b SHA-1: 758741111b1ae1e7df5726da4789d479db0f03d3 SHA-256: ed515b37c03ee5f687a049585b7ef9c2d1693ab84b1eb05629017fae1938130e
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed as a link farm. No scripts were extracted, but the primary function appears to be redirecting users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c155c744---49249047419.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/226f9792536518b1f0b716760a020b23/nivaranevikupamorix.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/61701005734.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07a72d984---solizozudinoratulorof.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/pipasirepubired.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a747110bbb0---mutiwivijogovoferudojeze.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/kipilotonarigevosavokimu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe23cc0d2ae---54363505008.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/99941459886.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/58648680693.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/85852531983.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b07ed797eab---30132483415.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53391419e---janelukelusaxer.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0b0b5f21---79745084723.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/50959739293.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/70714152649.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/bilusajujujevaxodon.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peverusujejejagi.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/39922180774.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/14254848186.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/dojoxidudulavikirowuduj.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/14968520593.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816825e7e2b---21736903180.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/49222113567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=deductive+reasoning+in+mathematics+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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 11188 bytes
SHA-256: e10b235e7974ab4131bcc14d95cf71a389b53681d1047c621ebc19eb2b683224
font_02_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 17812 bytes
SHA-256: 75517e58beb1a5e680b716c8fd3421bd1e92ddfa7db8139f3872051cace5af3e

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