Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c068c4a9ae3d7…

MALICIOUS

PDF

89.6 KB Created: 2021-07-05 13:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0de1519f70ad2b11d4eb4d52dcb5a03e SHA-1: 0e7ee33c7e3b1795d216232745b10be06389f6cf SHA-256: 156c068c4a9ae3d78f1bb94d2d88bd872269f4d9f66a886c5de43a3b9c91a89e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, directing users to compromised CMS uploads and disposable hosting. ClamAV and ML classifiers confirm maliciousness, indicating the document is designed to lead users to malicious sites. The primary attack pattern involves leveraging these links for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=rosary+of+liberation+chaplet
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ev56a38hbshcsrpunsgjgvlbov/suzusexedopu.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/zotusikadawobapijamoto.pdf
    • http://vnos.vn/app/webroot/uploads/files/mujisako.pdf
    • http://ahchala.com/img/file/80587337640.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/68642411708.pdf
    • https://peterdegendt.be/file/70586531928.pdf
    • http://10glazsikeyrosa.ru/file/zugonegedasitojaxorajatew.pdf
    • https://feng-shuiworld.com/userfiles/file/23098553926.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8lmjvhdp5hboar28re47i2lps5/rozepupexaroxixatapi.pdf
    • http://gesundimjob.at/images/content/files/xitofutaxagexes.pdf
    • http://allaboutdowney.com/userimages/1296755794.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/6866564979.pdf
    • https://najlepsze-w-polsce.pl/uploads/10336011609.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6b02b6484f44131a25a61dae0124e159/64131147876.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47aa05998b---54239564770.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a975782cb91---86783141324.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b84c6b0dc525a493e9a0a934c6b19bec/falamowuvinarumaridu.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9179d40496227e7bf6c282b19d36cf57/66288537080.pdf
    • https://xosobacninh.vn/webroot/img/files/rofofitexiv.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kelhvl11thqltor7ebb1r9j9j3/27069093473.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88935b1b5---nuwazugedaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f9.bin
71e5102dc5f8686b39c2bf3a2c01007a4f6f771a07dd30f99e7618f4efbec9e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 10876 bytes
font_01_sfnt_off000110df.bin
318a6a8788c0aa19a4836ff0bf705b6b99d25c8cec99b28437f41e78f8bbf200
pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 18512 bytes
font_02_sfnt_off00013ff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 16792 bytes