Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30d017b4821b8cb…

MALICIOUS

PDF

146.7 KB Created: 2021-09-01 04:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66709aa6a4092fc914b93a455f923295 SHA-1: aedca4b14ceaaf672e6aa3ad9136cfca019dd7e5 SHA-256: a30d017b4821b8cb2700fbb1d8879ce80bf7974fba190e0319d1eca1a9f3cf60
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c8sqvji4cphnunai60q28psrtm/65604309538.pdf In PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160747759447e8---380370147.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/tufaja.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/nudorazome.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/74408003998.pdfIn PDF document text
    • https://chp-travel.ir/data/file/30824005793.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/bizubivoveve.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/74461220159.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/jubibak.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095f86837e4a---7679922196.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf254d3a06e---vitogolalar.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/95780014738.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609473660a8af---93482030286.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pivajoli.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/kujalevosepunofas.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d4f312cca0880f4072f573519ef7e893/31435757013.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160794ea60d5d5---58082526534.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d7720271---43596758673.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/fapesunexabu.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/9476434105.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1afb4feec67d443613f9aaa883a0ee60/83195194698.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/10864019401.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1avdp08aotddkdn52pdd03r098/ludubosekivojig.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd20254d3f7---wufizope.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/61520182129.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf5a51ff96---56755075065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=glossary+of+indian+polity+termsPDF 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_off0001d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F051 19372 bytes
SHA-256: 3250e3ccc5732436ede191d4b4b557fc9dba2318d9af8269a3b4fe5ddcbb225a
font_02_sfnt_off000222c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222C5 10812 bytes
SHA-256: d3649becb22a9fb4d475cddaddba79f656a11e1d77813c85d4ed045b66819079

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