Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b018c9c3915b66…

MALICIOUS

PDF

92.3 KB Created: 2021-07-04 03:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 764c603d559793f17eb797124ca8a3eb SHA-1: ccfc668e748df28f1ff9094e872adf9352740b6b SHA-256: e1b018c9c3915b669731769d702027f21230e14f6e2b58ec599bd2b6ce83a8c3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ketchas.ru/uplcv?utm_term=times+where+was+i+answers PDF link annotation
    • http://sl-light.ru/design/img/upload/file/48260918194.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/12325571274.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/tisabepedu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbddb648195---12337203695.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b3e45dd72d95fef94785ade2699fd32b/10664163986.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e509066e---pebitunetunibuw.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8b8c3b1cede7a049a30a1efc324cc14a/xezopasebisoratuf.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/48633d2c7e142bdfad7c3db11fc196f8/rusixufasuxome.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d218403e---49174850050.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vobepukigeboset.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/37339709458.pdfIn PDF document text
    • https://petala.gr/userfiles/file/gebaduzojage.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/petavebapixekosifoxiw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tutaninawox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf66e6c8c---12630785916.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/kijeboveviluzikekewe.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ttqjlm9k61jfv40ed98e5eap76/37394398760.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/zuzadofoxakevovob.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/78665758673.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a6e238cc0b58b405310aae8d9d8410dc/fotewenupeniva.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/81563d6d84c8b96f1f4c84f332653f25/15073398197.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982eecd39a---93839847200.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/97971117577.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/va74op5velbott3pf8mb2d8ilo/30621579744.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/21432330433.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

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_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10160 bytes
SHA-256: 9400cba90e3d99c968e7491b2890f7228d4c546c81d78e8f3b8a5c4d39cc04a4
font_01_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 17440 bytes
SHA-256: f07cdee5a0c9ec648e9e06fe37eaa2b926bf32f0b1b4197c8fbe4daebdf6a664
font_02_sfnt_off00014bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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