Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb9785530538bcf…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 15:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 560cf06b537ffd84d13d951df8edb78a SHA-1: 812b7842ab717b68a6650b799320b93ce8edce06 SHA-256: 7cb9785530538bcf9bf6bc7a3eb6788ebd76a745b7f3299b1b731e2079911386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to lure users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acd8675c512---xuzig.pdf In PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/71505402720.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/25296006350.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/xeraduxilemixinefelexeles.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4b476a03e---dunesefof.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/26141692710.pdfIn PDF document text
    • http://imbirimbir.ru/files/zazida.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef1caf77b---rutalegalakizedafepowo.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/rirebebefakut.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/97873493253.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/96706146876.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160873bf228e51---86242891708.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5490ae395---zopotinujafekipideriwebez.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b52795a2---jovobun.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/gasafud.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/87887413845.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/sasuda.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/29198101108.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607199be16787---jedapajapogepezajejev.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611637fea2605---83911390928.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b807e895---19670425330.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/pakiragovawodorog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dw705+miter+saw+manualPDF link annotation
    • 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_off0000bbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBED 21268 bytes
SHA-256: 81e421df2f091d416dead43d3431cdfffca67243c80ab1b90d2b4328e88260af
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10640 bytes
SHA-256: 6bdf49ff680b0a18bce11c36d1ec063980027f3e583430ec17fcae26e7ef5c6e

Open this report in the interactive analyzer, or submit your own file for analysis.