Malicious PDF — malware analysis report

Static analysis result for SHA-256 446ede929ceb1df8…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 12:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58e74874b66ca6122bd5b95f82dc8e9d SHA-1: e75aa8c23edc12409e57a2e9ff3b2c44c631a44c SHA-256: 446ede929ceb1df80c36c700ba31ea921e6b144123540733cfde5d7dc86a23a5
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms strongly suggests an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.waetsukai.jp/system/ckfinder/userfiles/files/26760751146.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149fa8cd2d38---gunuzapilivaketetoxivugi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/dexisolup.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/21pt0vvuq93i9pqoamloe5djvv/vunajod.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/jagamukuvifinimaze.pdfIn PDF document text
    • http://chemicalengineers.ie/images/guvegok.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/jujufomezoviw.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210921080645.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/97792742466.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000d3d5118---basenurof.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/tajebejasamafuselusil.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/70572971235.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/73084674422.pdfIn PDF document text
    • https://bloomeng.com/uploads/13644298375.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c994c92f0---kebegegojigoguzido.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/pefegewojapiretomaji.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135038eb7b86---puzapo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c5660785fcbf8e1101d56788b1ecda77/sabos.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/fidomunagojajiroxinopiga.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/minokos.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe68d72e7---gexoluxapedopuba.pdfIn PDF document text
    • https://noddy.nu/images/file/favepokivojiresomomesakox.pdfIn PDF document text
    • http://tzsunup.com/upload/75278693913.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/81335704062.pdfIn PDF document text
    • http://rem-proekt.com/f/file/zejodukigafebira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tap+booster+iosPDF 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_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 15784 bytes
SHA-256: 360ca4e666ee3e55b63b134c05f93c486411327bdd0c3d42589170608e3a0e8b
font_01_sfnt_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 10200 bytes
SHA-256: d37c6c3acba2e5b5d576c56d4f3f67e076c9887f8e602b38a6bc801d2a807cbf
font_02_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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