Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aaf88998094719…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 11:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 580b2ea4ac11553581a51d698798dbff SHA-1: 540d770722ca17b088bf011849be9cec11087522 SHA-256: b4aaf88998094719736a877041cc74e3a8f19e860caa1e5e4e3cbe7986758b99
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting. The heuristic firings indicate it functions as a link farm, likely designed to redirect users to malicious sites for phishing or malware delivery. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=hot+point+fitness+pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338ca32fe5f---56091147218.pdf
    • http://insei.eu/userfiles/files/33473398094.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/wiwitadizopiwuburavodu.pdf
    • https://performanshost.com/calisma2/files/uploads/95757637249.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/52867692174.pdf
    • http://hydrogears.com/survey/userfiles/files/54447206190.pdf
    • https://aadharshilaschool.org/userfiles/file/85511119898.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/82f70bfbe239509eaa6cf6b3d7f46b9e/63362502946.pdf
    • https://kimcert.net/E/file/93141691933.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/79238377501.pdf
    • https://ihotel2b.com/upfiles/editor/files/55210225377.pdf
    • https://iwanbim.com/userfiles/files/74867621659.pdf
    • http://ros-audit.com/i/up/file/wubarulimukifesero.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/bazowowalujumixe.pdf
    • http://sz-nuoyi.com/Upload/file/2021090323321727660.pdf
    • https://hanomanberjaya.com/contents/files/42167500901.pdf
    • https://mehreganimaging.com/images/upload/files/12626762193.pdf
    • http://csptech.net/admin/userfiles/file/35842012432.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4cf967f1---64045206236.pdf
    • https://ilonew.tasksplan.com/userfiles/files/tamigemizabumagevomiv.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f5278f878ce10035ef96503956dbf3f/70924979658.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/66957792508.pdf
    • https://mantyobras.com/userfiles/file/zufoxofiserapotogosezug.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b030537fe87966c27efb3e40e4a289d1/batokepalurazale.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lupafux.pdf
    • http://artsar.pl/userfiles/file/26421699090.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_off0000c3a5.bin
d800883cab15c0177543c87addf746d078f022f194eccd6e7398906440a4bb72
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A5 17588 bytes
font_01_sfnt_off0000f17e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 16792 bytes
font_02_sfnt_off00010995.bin
5cfc42aafd3b0be0697f1244e1c93b1888316aabee5f4bfdfa781bd1d1d8d285
pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10176 bytes