Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7bdc2fc11d77b3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-22 19:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffdef1d59d225ff880c45c461f1cd4e8 SHA-1: 7d8c9c997021e4202d1a4d92a7e532497829d4e5 SHA-256: fa7bdc2fc11d77b37524dadb8166bf49b71ed77c2cf3cc2db86630fbeb171872
204 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript and external URIs, flagged by ML classifiers and ClamAV as malicious. It exhibits characteristics of a remote-support tool lure, instructing the user to install such software, which is a high-risk action in an unsolicited document. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code, likely to facilitate unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://queure.ru/uplcv?utm_term=install+ubuntu+on+android+tablet PDF link annotation
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404717d1dba---fadajukogiwusamuxuruxela.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/kezovapi.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/togovadox.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xakule.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/91527220587.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/kulifabudi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149898646d77---93546506017.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zamopetowedijazumabi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dad429378---dikan.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/jafedajali.pdfIn PDF document text
    • https://gdaniec.com/upload/files/vopov.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/1466910835.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/38150254274.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/39888506430.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/51171068034.pdfIn PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/ladinewal.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k0d5hm2mv7rof4b1lbiam99t62/xulaxozirew.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tovaxes.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/lefudupuxilukav.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/dizusupamuzow.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333c7974f51---49094336485.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/66929069694.pdfIn PDF document text
    • http://domplus.su/userfiles/files/92887407868.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/sapozilifiwodiwuwixopo.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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10432 bytes
SHA-256: d3cc720e65e0bb30a860dfa5704670916317b1579de0e695eb38855d3c83214f
font_01_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 18012 bytes
SHA-256: 6c775ceafa4b23943ce3deb18f0c76cae9c6c529b09dd6be4886c25677d9f378

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