Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d829f1c248cc47…

MALICIOUS

PDF

94.7 KB Created: 2021-07-13 23:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91d94b5afb0fa98166688120cf163298 SHA-1: 8c9a08a1fbd923ac8a5f1ba126674c74d67844e1 SHA-256: a9d829f1c248cc479193f384fcd8f0f4db2676be97259c69900c6d7bade22284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and using UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rhodium.vn/uploads/news_file/93679176356.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a5ea165a---bijifazawewux.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0ad42ceb0c26eb364fa7258eda8b3903/lubomowax.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/60183147791.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a631bcb1e60---49484587913.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab7131e3d---pefaledupigazagelofulot.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083319d628bf---24742899976.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/46905031236.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/tofiripamazotuvavirasoj.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/51075603610.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0629a7a22fa8ea1f9966a1a721645ba3/wefezuvazidubokugumofamep.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/gedezivetibebe.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kubadisimiragovefakosasuz.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ecb6b041---satevej.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/12194671113.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/531649c30524823c9b8578e5122f5b7e/kinodowewidegoxalafos.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/96731929712.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/7g4qtvq8h9cnl9se0nss7iekkn/kumunezib.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/16340670361.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/fobusipetapusisetogiboma.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/et8vr5rdkmou43gskgiu4pi15k/49958505639.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dea84c7ae---96709624730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=afghanistan+where+god+only+comes+to+weep+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_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 19116 bytes
SHA-256: 9c5c06176e96d7f92b94af5d57039a4cf6efcefefd3debb7c769577f78f3da16
font_01_sfnt_off0001396f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15186 11248 bytes
SHA-256: a65ec08a5ebdccf49bf076143e174b6a659b9c566d93e3d6a8a87b5dba79c18b

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