Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24051f640229889…

MALICIOUS

PDF

114.3 KB Created: 2021-06-28 05:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 76f5d538c81686ba3dcd4c24d1fa2fc0 SHA-1: 9e3615330d7943afb9199a71ab599369b6852fd5 SHA-256: d24051f64022988957dc8aa87a89aab691ff76a3fff66a90b3e8659dd8cabb47
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a tactic to distribute malicious content or engage in SEO poisoning. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6bl6p4picik188n4ltofvbot4f/rigokus.pdf In PDF document text
    • https://ph2020.org/FCKeditor/file/20278971865.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bafd9584c---bobufefa.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48c10a551---2789963578.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6q795rc7q66bitf31mts1jkobi/norofa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/98642627234.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5b17d844ed45790657876365464c49ab/74109681947.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/kjmk0v0j7ffnmiss2aiop8ht53/kolusupitanidovewufe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b2a814e27---41563824116.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c919bce53e3---94953041674.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/sisatesoguvimepuwivo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608255fd2e350---ribulexuzesepotar.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-27/20210627122639358729.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607474bed324d---82720722041.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/586ea659f2b088aeecefc8e0df21a8a3/danomedop.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b233a499a---napigotevebepinozaduv.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/xebodamobamazojokoxa.pdfIn PDF document text
    • https://atl-50.com/files/file/nasemerep.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/52052411837.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/rurutebusanada.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609326ac12d7d---75693684643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=edta+in+lead+poisoningPDF 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_off00015c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C45 10452 bytes
SHA-256: 4a4bc704ab83269502c98d787ee75f2a5dd1b98a1c95b57d6682e0e660f588e5
font_01_sfnt_off000173d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D5 18248 bytes
SHA-256: 6662a810abc5cb84b0e65c724327608f7b7008d1668ac5bb612dc2f51977886f
font_02_sfnt_off0001a3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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