Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e34dbcc97bae1a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-14 11:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cc8b22b920726bd9bd543ced0008984 SHA-1: a1630cee63e688cab59fa8ec517749a0266078a0 SHA-256: d4e34dbcc97bae1a1d3c5490558da95aac265cd48596fe1d43ea5d9ca457d512
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for malicious PDFs to execute code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=phone+keyboard+tricks PDF link annotation
    • http://statsale.com/data/upload/ck/files/jalojapejugujij.pdfIn PDF document text
    • http://373113.linker.tw/files/zofipazafiwi.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/20867626544.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_12_04_13_07_1360.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210908193000.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/kujovatiruruvumi.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/xebikawuluw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5fbee2fa---figewipopimufur.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/19031088160.pdfIn PDF document text
    • http://snft.ro/media/file/27130822839.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/buzixixade.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/lijunikopofutagafamukudi.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/fojararurusiniz.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff220aede3---sotosojopurazemeduzaz.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/51862966327.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/77879109520.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/92221731449.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/55844007884.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e5fb02e7a705233f85c5be67eb2aa74d/39050787173.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/suzuji.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/dazepomixebajud.pdfIn PDF document text
    • https://riwg.in/userfiles/file/66612926459.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3fbd5de8---49178947842.pdfIn PDF document text
    • https://pixel.bg/img/file/telajitefofuvawid.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/43768745838.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/71539655626.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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 10768 bytes
SHA-256: e55e79cf15c88d4b101651c6050f4d9a66dd212910fe4776259d9a6c3ae09cc4
font_01_sfnt_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 17740 bytes
SHA-256: 41680bc0b5e3fa749a30a9fd96c3d5523611c8386ea1f16899bae52fb79a96a4

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