Malicious PDF — malware analysis report

Static analysis result for SHA-256 379e90b635a750dc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 03:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cac85ff32e12b3c863b1e67ed8213121 SHA-1: b1342f5c38e2b57381a565af44f498acda10eb52 SHA-256: 379e90b635a750dc6ee606ad38df2be6f8bf31f05105f90281e67f5f4df236fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and external URI links. The document body is unreadable, but the presence of JavaScript and numerous external URLs suggests an attempt to redirect the user to malicious sites. The links point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=if+playstore+is+not+downloading PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26e71e65c---xelebokuzezisixuxonisa.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nenugakaxisi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/gibevopajevogurag.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26b943e9---42707417426.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/88121703746.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/85775111341.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/68540142380.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/wolevit.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/5571607075.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/fujarib.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/naridibisaposimuw.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/fofuwenuzazo.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210902101105.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///rasudufuwoli.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/7577439474.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/jiwul.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ae926d184a2c32f458bd073e764dc7bd/xilafesi.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/gobebarukaso.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/23689046988.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/34063555479.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/70328096335.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/dikutota.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 10824 bytes
SHA-256: 8578a1081e95b027babb29c6faf8af89ad8bc0e1fffa2883fdb79b814bb8e4ef
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 17552 bytes
SHA-256: beb6d1d57bb0a63652a50baaac78e63676c575fda23a7abd3b8e0653497d097e
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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