Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce273e72e7c81271…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 21:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41bb27aa03d4790b829c850a87e50af6 SHA-1: 5f57949f28e7ebfaf30892a6b60e9500105d5ea2 SHA-256: ce273e72e7c812710bccfbe55da8f84f203a25db27782f0878bab9f449a6db80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of numerous external URIs indicates a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=b%C3%ADblia+apolog%C3%A9tica+de+estudo+pdf+gratis PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab650535459---72325974971.pdfIn PDF document text
    • http://friulanapanini.com/images/file/zisulubitapiramunibupufep.pdfIn PDF document text
    • http://rc-modeller.se/images/file///58070562594.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/16035471108.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/b929a59d52d1d04ff97eac65240629c7/66791407992.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6qvdmbfivhp00ffbhl5erkph1t/basowewutowafaragagafeji.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/litabajewuxeda.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822800cbefd---sunadeviluv.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/76fc8320bb541cc755e69e40c225d778/vufuwakimofikerubamimeto.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/85418933670.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/32e99c57a8b30eb65c0350d6d6fcaee4/44003072912.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc12df85c---1095514017.pdfIn PDF document text
    • http://446888.top/userfiles/file/nitasapi.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87019439322.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pbogqg4u1srr0fm9o73iir7tsh/muvor.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/773413c094c7fb790f2b3d8addc86c7a/doxebuvataxotozizop.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/32329949921.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/lilesesazufaziwabibolat.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c90104f55dd12895a7512b61d8b99268/56957250112.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/12053750013.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210727225939.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/zuvimusevunigifudo.pdfIn PDF document text
    • 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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 19824 bytes
SHA-256: 81da65d2282af935b701088e704c8bf88b35addfa37a4613dc7c29692a32a14e
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 11200 bytes
SHA-256: ba387c55bf88aa3710a5c9855e91e07d2333282685e89ba4aeaf37a9c04f42e6
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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